300+ REAL TIME Organic Chemistry Objective Questions & Answers 2023

250+ TOP MCQs on Reaction of Alcohols and Answers

Organic Chemistry Multiple Choice Questions on “Reaction of Alcohols”.

1. Which one of the following compound is obtained by the oxidation of primary alcohol with nascent oxygen?
a) Alkanal
b) Alkanone
c) Ether
d) Amine
Answer: a
Clarification: Oxidation of alcohols to aldehydes is partial oxidation; aldehydes are further oxidized to carboxylic acids. Conditions required for making aldehydes are heat and distillation. In aldehyde formation, the temperature of the reaction should be kept above the boiling point of the aldehyde and below the boiling point of the alcohol.

2. Which one of the following compound is obtained by the oxidation of secondary alcohols by [O]?
a) Ketone
b) Aldehyde
c) Ether
d) Amine
Answer: a
Clarification: Ketone compound is obtained by the oxidation of secondary alcohols by nascent oxygen atom [O].

3. Secondary alcohols on catalytic dehydrogenation by Cu-Ni couple gives ___________
a) Ketone
b) Aldehyde
c) Carboxylic acid
d) Amine
Answer: a
Clarification: When the vapours of a secondary alcohol are passed over copper heated at 573K, the corresponding ketone is formed.

4. The reaction of carboxylic acids with alcohols catalysed by conc. H₂SO₄ is called __________
a) Dehydration
b) Saponification
c) Esterification
d) Neutralization
Answer: c
Clarification: When a carboxylic acid is treated with an alcohol and an acid catalyst, an ester is formed (along with water). This reaction is called the esterification.

5. Which one is the correct order of reactivity of different types of alcohol towards hydrogen halide?
a) 1° alcohol > 2° alcohol > 3° alcohol
b) 2° alcohol > 1° alcohol > 3° alcohol
c) 3° alcohol > 1° alcohol > 2° alcohol
d) 3° alcohol > 2° alcohol > 1° alcohol
Answer: d
Clarification: Reaction of HX with alcohol depends on the degree of carbonation generated due to heterocyclic cleavage of HX bond. If alcohol is primary alcohol then reaction will proceed through Sn2 for tertiary alcohol it will proceed with Sn1. For secondary alcohol it can go through both path (Sn1 or Sn2). Sn1 being ionic in nature takes place very fast while Sn2 is molecular in nature reacts slowly. Hence, we can sum up above, Rate of reaction is 3° alcohol > 2° alcohol > 1° alcohol.

6. The dehydration of alcohols is an example of ________
a) Bimolecular elimination/E2 reaction
b) SN2 reaction
c) SN1 reaction
d) Unimolecular elimination/E1 reaction
Answer: d
Clarification: Alcohol upon reaction with protic acids tends to lose a molecule of water to form alkenes. These reactions are known as dehydration of alcohols. Dehydration of alcohols is an example of Unimolecular elimination reaction.

7. Among the following, which is least acidic?
a) Phenol
b) O-cresol
c) p-nitrophenol
d) p-chlorophenol
Answer: b
Clarification: O-cresol is least acidic because Presence of electron withdrawing groups at ortho and para position increases the acidic strength, whereas electron releasing or donating groups at ortho and para position decreases acidic strength. In cresol (ortho or para cresol), methyl group is +I group, so it destabilises the anion formed after ionisation, hence cresol is less acidic than carbolic acid (phenol).

8. Which of the following alcohols would be most soluble in water?
a) Propanol
b) Hexanol
c) Pentanol
d) Butanol
Answer: a
Clarification: Propanol is the most soluble in water among given alcohols, as solubility of alcohols in water decreases with increase in molecular mass.

9. What is the best reagent to convert isopropyl alcohol to isopropyl bromide?

a) HBr
b) SOBr₂
c) Br₂
d) CH₃MgBr
Answer: b
Clarification: Thionyl bromide will react with secondary alcohols and give a reasonable percent yield of the bromide.

10. The major reason that phenol is a better Bronsted acid than cyclohexanol is ____________
a) it is a better proton donor
b) the cyclohexyl group is an electron donating group by induction, which destabilizes the anion formed in the reaction
c) phenol is able to stabilize the anion formed in the reaction by resonance
d) the phenyl group is an electron withdrawing group by induction, which stabilizes the anion formed in the reaction
Answer: c
Clarification: Whenever resonance exists, it usually is a very important factor to be considered in decisions about structure and reactivity correlations and in many cases, it is the most important factor. In this case there is delocalization of the electrons into the benzene ring.

250+ TOP MCQs on Preparation of Benzaldehyde & Aromatic Ketones and Answers

Advanced Organic Chemistry Questions and Answers on “Preparation of Benzaldehyde & Aromatic Ketones”.

1. The oxidation of toluene to benzaldehyde by chromyl chloride is called as which of the following?
a) Cannizzaro reaction
b) Wurtz reaction
c) Etard reaction
d) Reimer-Tiemann reaction
Answer: c
Clarification: The oxidation of toluene to benzaldehyde by chromyl chloride is called as Etard reaction.

2. Benzaldehyde can be prepared by oxidation of toluene by which of the following reagent?
a) Acidic KMnO₄
b) K₂Cr₂O₇
c) CrO₂Cl₂
d) basic KMnO₄
Answer: c
Clarification: Benzaldehyde can be prepared by oxidation of toluene by CrO₂Cl₂.

3. The oxidation of benzyl chloride with lead nitrate gives which of the following compound?
a) Benzaldehyde
b) Benzyl alcohol
c) Benzoic acid
d) p-chlorobenzaldehyde
Answer: a
Clarification: The oxidation of benzyl chloride with lead nitrate gives benzaldehyde as shown in given reaction. Pb(NO₃)₂ is a mild oxidizing agent so benzaldehyde is formed during the oxidation of benzyl chloride with Pb(NO₃)₂.

4. Which of the following is the commercial method of preparation of benzaldehyde?
a) Oxidation of toluene
b) Oxidation of benzyl chloride
c) Oxidation of benzyl alcohol
d) Etard reaction
Answer: c
Clarification: This involves the treatment of benzyl alcohol with dil. HNO₃ or acidic potassium dichromate or chromic anhydride in acetic anhydride or with copper catalyst at 350^o C. This process is used for commercial production of benzaldehyde.

5. Which of the following is the not a method of preparation of benzaldehyde?
a) Gattermann Koch synthesis
b) Etards reaction
c) Stephan’s reaction
d) Oxidation of secondary alcohol
Answer: d
Clarification: Oxidation of secondary ketones is the method of formation of ketones not aldehydes.

6. What reagents will be used in the preparation of benzaldehyde via Gattermann Koch synthesis?
a) Carbon dioxide and HCl
b) Carbon monoxide and HCl
c) Oxygen and H₂SO₄
d) Carbon monoxide and H₂SO₄
Answer: b
Clarification: Benzene is converted into benzaldehyde by passing a mixture of carbon monoxide and HCl gas under high pressure into the ether solution of benzene in presence of anhydrous aluminum chloride and cuprous chloride.

7. Partial reduction of phenyl cyanide with stannous chloride and passing dry HCl gas in ether solution followed by hydrolysis of the aldimine stannic chloride with water to form benzaldehyde is called as which of the following method of preparation of benzaldehyde?
a) Gattermann Koch synthesis
b) Etards reaction
c) Stephan’s reaction
d) Gattermann reaction
Answer: c
Clarification: Partial reduction of phenyl cyanide with stannous chloride and passing dry HCl gas in ether solution followed by hydrolysis of the aldimine stannic chloride with water to form benzaldehyde is called as Stephan’s reaction.

8. Ozonolysis of styrene will lead leads to formation of benzaldehyde along which compound?
a) O₂
b) H₂O₂
c) HCHO
d) H₂O₂ and HCHO
Answer: c
Clarification: Ozonolysis of styrene will lead leads to formation of benzaldehyde H₂O₂ and HCHO.

9. Which of the following cannot be used in formation of benzaldehyde by Grignard reagent?
a) HCN
b) Carbon monoxide
c) Ethyl format
d) HNC
Answer: c
Clarification: Reagents like carbon monoxide or HCN and ethyl format can be used for formation of benzaldehyde by Grignard reagent.

10. What is the laboratory method for the formation of benzaldehyde?
a) Gattermann Koch synthesis
b) Etards reaction
c) Stephan’s reaction
d) Oxidation of benzyl chloride
Answer: d
Clarification: Benzaldehyde conveniently prepared by boiling benzyl chloride with copper nitrate or lead nitrate solution in a current of carbon dioxide.

11. Formation of aromatic ketone forms from benzene by CH₃COCl?
a) Friedal craft alkylation
b) Friedal craft dealkylation
c) Friedal craft acylation
d) Friedal craft hydroxyalkylation
Answer: c
Clarification: Friedal craft acylation froms aromatic ketone. A proper choice of acid chloride here gives the desired ketone. The method works for all types of ketones though the bulkier aryl acid chlorides may require stronger / longer heating.

12. What will be the product for the given reaction?
a) Propanone
b) Acetophenone
c) Diphenylmethanone
d) Aliphatic and aromatic
Answer: d
Clarification: Heating solid calcium salts of benzoic acid with those of any other carboxylic acid, except methanoic acid, gives the ketones in low yields.

13. What will be the product of the given reaction?

a) Propanone
b) Acetophenone
c) Diphenylmethanone
d) Aliphatic and aromatic
Answer: b
Clarification: Aromatic ketones were efficiently prepared in good yields by the reactions of aryl bromides with n-BuLi, followed by the reactions with aromatic aldehydes or aliphatic aldehydes and the subsequent treatment with molecular iodine and K₂CO₃, in a one-pot method.

14. Which reactant can be used to form aromatic ketone for the following reaction?

a) Arenes
b) Aldehyde
c) Alcohol
d) Terperens
Answer: a
Clarification: Aromatic ketones were efficiently prepared in good yields by the reactions of arenes with n-BuLi, followed by the reactions with aromatic aldehydes or aliphatic aldehydes and the subsequent treatment with molecular iodine and K₂CO₃, in a one-pot method.

15. Aromatic ketones were synthesized from aromatic compounds via liquid‐phase oxidation at 60 °C and 1 atm over vanadium‐containing which catalyst?
a) MCM-41
b) MCM-48
c) ZSM-5
d) ZK-5
Answer: a
Clarification: Aromatic ketones were synthesized from aromatic compounds via liquid‐phase oxidation at 60 °C and 1 atm over vanadium‐containing MCM‐41 catalysts using a batch reactor. The catalysts were prepared by direct hydrothermal (4V‐MCM‐41) and wet impregnation (9V/MCM‐41) methods.

16. Which of the following cannot be used as reactant in preparation of aromatic ketones from diazonium salt?
a) formaldoxime
b) Acetaldoxime
c) propionaldoxime
d) Terpernes
Answer: d
Clarification: Diazonium salts react with formaldoxime, acetaldoxime, propionaldoxime, and acetaldehyde semicarbazone severally, under carefully controlled conditions, to give arylated derivatives which can be hydrolysed to aromatic ketones.

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250+ TOP MCQs on Esters and Answers

Organic Chemistry Multiple Choice Questions on “Esters”.

1. Which of the following compounds is an ester?
a)
b)
c)
d)
Answer: c
Clarification: Esters are characterized by their possession of a modified carboxyl group, in which the H of the -OH group is replaced by an alkyl group, to form the general functional group -COOR.

2. Which of the following is used as catalyst for the esterification of carboxylic acid and alcohol?
a) Nitrous acid
b) Sulphuric acid
c) Sulphurous acid
d) Nitric acid
Answer: b
Clarification: The classic synthesis is the Fischer esterification, which involves treating a carboxylic acid with an alcohol in the presence of a dehydrating agent:
RCO₂H + R′OH ⇌ RCO₂R′ + H₂O
The equilibrium constant for such reactions is about 5 for typical esters, e.g., ethyl acetate. The reaction is slow in the absence of a catalyst. Sulfuric acid is a typical catalyst for this reaction.

3. What will be the product for the given reaction?
CH₃OH + CO →?
a) Ethyl formate
b) Methyl formate
c) Ethyl acetate
d) Methyl acetate
Answer: b
Clarification: The carbonylation of methanol yields methyl formate, which is the main commercial source of formic acid.
CH₃OH + CO → CH₃O₂CH

4. Hydrolysis of ester leads to the formation of which of the following products in basic medium?
a) Ether and alcohol
b) Alcohol and sodium carboxylate
c) Aldehyde and alcohol
d) Sodium carboxylate
Answer: b
Clarification: Under basic conditions, hydroxide acts as a nucleophile, while an alkoxide is the leaving group.

5. What will be the product for the given reaction?
C₂H₄ + CH₃CO₂H + 1⁄2 O₂ →?
a) Ethyl formate
b) Vinyl formate
c) Ethyl acetate
d) Methyl acetate
Answer: b
Clarification: In the presence of palladium-based catalysts, ethylene, acetic acid, and oxygen react to give vinyl acetate:
C₂H₄ + CH₃CO₂H + 1⁄2 O₂ → C₂H₃O₂CCH₃ + H₂O

6. What is the characteristic smell for ester?
a) Fruity like smell
b) Fish like smell
c) Rotten egg smell
d) Alcoholic smell
Answer: a
Clarification: Many esters have distinctive fruit-like odors, and many occur naturally in the essential oils of plants. This has also led to their commonplace use in artificial flavorings and fragrances when those odors aim to be mimicked.

7. Salts of carboxylate anions can be alkylating agent with alkyl halides to give esters. In the case that an alkyl chloride is used, an iodide salt can catalyze the reaction. What is the name reaction for the given reaction?
a) Favorskii rearrangement
b) Baeyer–Villiger oxidation
c) Pinner reaction
d) Finkelstein reaction
Answer: d
Clarification: Salts of carboxylate anions can be alkylating agent with alkyl halides to give esters. In the case that an alkyl chloride is used, an iodide salt can catalyze the reaction this reaction is known as Finkelstien reaction.

8. What will be the product of given reaction?

a) Ether and alcohol
b) Alcohol and sodium carboxylate
c) Aldehyde and alcohol
d) Carboxylic acid and alkene
Answer: d
Clarification: Ester pyrolysis in is a vacuum pyrolysis reaction converting esters containing a β-hydrogen atom into the corresponding carboxylic acid and the alkene.

9. Fries rearrangement reaction of phenol ester leads to the formation which type of product?
a) Ketone
b) Aldehyde
c) Alcohol
d) Alkene
Answer: a
Clarification: The Fries rearrangement is a rearrangement reaction of a phenolic ester to a hydroxy aryl ketone by catalysis of Lewis acids.

10. What is the order or solubility in water of the following compound?

i) ethyl methanoate
ii) ethyl butanoate
iii) ethyl ethanoate
iv) ethyl propanoate

a) i > ii > iii > iv
b) i > iii > iv > ii
c) i > ii > iv > iii
d) iii > i > iv > ii
Answer: b
Clarification: As chain length increases, the hydrocarbon portion forces itself between water molecules, breaking the relatively strong hydrogen bonds between water molecules without offering an energetic compensation; furthermore, the water molecules are forced into an ordered alignment along the chain, decreasing the entropy in the system. This makes the process thermodynamically less favorable, and so solubility decreases.

250+ TOP MCQs on Stereoisomers and Answers

Organic Chemistry Multiple Choice Questions on “Stereoisomers”.

1. What is the complete IUPAC name of the following substance?

a) (1S,3S)-1-methylcyclopentane-1,3-diol
b) (1R,3R)-1-methylcyclopentane-1,3-diol
c) (1S,3R)-1-methylcyclopentane-1,3-diol
d) (1R,3S)-1-methylcyclopentane-1,3-diol
Answer: d
Clarification: The IUPAC name will be (1R,3S)-1-methylcyclopentane-1,3-diol, where 1 position shows R and 3 position shows S.

2. How many stereoisomers are there for the following structure?

a) 1
b) 2
c) 3
d) 4
Answer: c
Clarification: In the case of 2,3-dihydroxybutanedioic acid, known as tartaric acid, the two chiral centers have the same four substituents and are equivalent. As a result, two of the four possible stereoisomers of this compound are identical due to a plane of symmetry, so there are only three stereoisomeric tartaric acids.

3. How many stereoisomers of 3-bromo-2-butanol, CH₃CH(OH)CHBrCH₃, exist?
a) 3
b) 1
c) 2
d) 4
Answer: d
Clarification: 3-Bromo-2-butanol has two chirality centers with different sets of four substituents. Each chirality center can have either an S or R configuration. For a compound with n chirality centers there is the possibility of a maximum of 2n stereoisomers. In this case there is more than one stereoisomer.

4. How many stereoisomers of 2,3-butanediol, CH₃CH(OH)CH(OH)CH₃, exist?
a) 3
b) 4
c) 1
d) 2
Answer: a
Clarification: 2,3-Butanediol has two chirality centers but the sets of four substituents on each chirality center are identical. Each chirality center can have either an S or R configuration. The (2R,3R) and (2S,3S) compounds are enantiomers of one another, but the structures drawn as (2R,3S) and (2S,3R) compounds are identical (this is the achiral meso compound), so there are only three different stereoisomers. For a compound with n chirality centers there is the possibility of a maximum of 2n stereoisomers. However, if the sets of four substituents on each chirality center are identical there will be fewer than 2n stereoisomers.

5. What is the complete IUPAC name of the following stereoisomer?

a) (1S)-2-ethyl-3,3-dimethylcyclopentane
b) (1R)-2-ethyl-3,3-dimethylcyclopentane
c) (1S)-1-ethyl-,3,3-diimethylcyclopentane
d) (1S)-3-ethyl-1,1-diimethylcyclopentane
Answer: c
Clarification: The IUPAC name will be (1S)-1-ethyl-,3,3-diimethylcyclopentane, where at 1 position it is S.

6. Which of the following structures represent the same stereoisomer?

a) Only 1 and 2
b) Only 2 and 3
c) 1, 2 and 3
d) Only 3 and 1
Answer: b
Clarification: It is important that you can rotate around carbon-carbon single bonds to make different conformations, and to rotate molecules in three-dimensions to compare their chirality chemistry (model kits are often useful). Another way to determine which of these structures are identical is to determine the configuration of each chirality center. In this case, for each chirality center the priority of the substituents is -Cl >; -CHClCH₃ >; -CH₃ >; -H. For example, the configurations of the chirality centers of compound 1 are both S. However, 1 and 3 are not identical.

7. Which of the following compounds can exhibit geometrical isomerism?
a) 1-Hexene
b) 2-Methyl-2-Pentene
c) 3-methyl-1-pentene
d) 2-Hexene
Answer: d
Clarification: There are several isomers of hexene, depending on the position and geometry of the double bond in the chain. One of the most common industrially useful isomers is 1-hexene an alpha-olefin.

8. How many number of stereoisomers possible for 2, 3-pentanediol?
a) 3
b) 4
c) 5
d) 6
Answer: b
Clarification: 2, 3-pentanediol contains two chiral atoms. So, the number of possible stereoisomers is 4 (22).

9. How many chiral stereoisomers can be drawn for CH₃CHFCHFCH(CH₃)₂?
a) 4
b) 5
c) 6
d) 7
Answer: a
Clarification: CH₃CHFCHFCH(CH₃)₂ contains 2 chiral atoms. So, the number of possible stereoisomers is 4 (2²).

10. What is the total number of isomers, stereoisomers included, designated by the dichlorocyclopentane?
a) 7
b) 6
c) 4
d) 5
Answer: a
Clarification: 3 structural isomers, but if you are considering chirality/diastereomers, there are two chiral carbons, so the maximum number of stereoisomers is 22=4, from which cis-1,2-dichlorocyclopentane and cis-1,3-dichlorocyclopentane will have same structure in their individual 4 isomers as shown below, so total isomers will be 7.

250+ TOP MCQs on Copolymerisation and Answers

Organic Chemistry Multiple Choice Questions on “Copolymerisation”.

1. Which of the following is true about copolymerisation?
a) radical, coordination, anionic, or cationic polymerization, depending on the type of initiation
b) addition of monomer to a metal complex, propagation is by successive insertion of monomer at the metal, and termination occurs when the metal complex separates from the polymer
c) monomers react by eliminating small molecules like H₂O, NH₃, CH₂O and NaCl in a repetitive manner, Indefinite growth of the polymer occurs at both ends
d) a mixture of more than one (or different) monomeric species is allowed to polymerize
Answer: d
Clarification: When two or more different monomers unite together to polymerize, the product is called a copolymer and the process is called copolymerization. If M and N are present together, Random type MM MN NNN MM N M MM N N…… and Alternating type M N M N M N M N M ………

2. Gradient copolymer comers under which of the following copolymer category?
a) Linked copolymer
b) Branched copolymer
c) Terepolymer
d) Brush copolymer
Answer: a
Clarification: Linear copolymers consist of a single main chain and gradient copolymers are single chain of polymer in which the monomer composition changes gradually along the chain.

3. Which of the following copolymers is the copolymer with regular alternating A and B units?
a) Alternating copolymer
b) Periodic copolymer
c) Statistical copolymer
d) Block copolymer
Answer: a
Clarification: Alternating copolymers are with regular alternating A and B units, as shown below. This sequence will not change.
—- A-B-A-B-A-B-A-B-A-B-A-B-A-B-A-B-A-B—-

4. Which of the following copolymers is the copolymer with A and B units arranged in a repeating sequence?
a) Alternating copolymer
b) Periodic copolymer
c) Statistical copolymer
d) Block copolymer
Answer: b
Clarification: Copolymers with A and B units arranged in a repeating sequence are periodic polymers as shown below. This sequence will repeat itself to form a polymer.
(A-B-A-B-B-A-A-A-A-B-B-B)_n

5. Which of the following copolymers is the copolymer with sequence of monomer residues follows a statistical rule?
a) Alternating copolymer
b) Periodic copolymer
c) Statistical copolymer
d) Block copolymer
Answer: c
Clarification: Copolymers with sequence of monomer residues follows a statistical rule, are called as statistical copolymer, as shown in below. This sequence will not change.

—- A-B-B-B-A-B-A-B-A-B-A-A-B-B-B-A-A-B—-

6. Which of the following copolymers is the copolymer which comprises two or more homopolymer subunits linked by covalent bonds?
a) Alternating copolymer
b) Periodic copolymer
c) Statistical copolymer
d) Block copolymer
Answer: d
Clarification: Copolymers which comprises two or more homopolymer subunits linked by covalent bonds, are called as block copolymer, as shown in below. This sequence will not change.

—- B-B-B-B-B-A-A-A-A-A-B-B-B-B-B—-

7. Which of the following copolymers is the copolymer in which the main chain is formed from one type of monomer A and branches are formed from another monomer B?
a) Terepolymer copolymer
b) Graft copolymer
c) Statistical copolymer
d) Star copolymer
Answer: b
Clarification: Copolymers in which the main chain is formed from one type of monomer A and branches are formed from another monomer B, are called as graft copolymer, as shown in below. This sequence will not change.

8. Which of the following copolymers is the copolymer with several polymer chains connected to a central core?
a) Terepolymer copolymer
b) Graft copolymer
c) Statistical copolymer
d) Star copolymer
Answer: d
Clarification: Copolymers with several polymer chains connected to a central core, are called as star copolymer as it is in star shape, as shown in below. This sequence will not change.

9. Which of the following copolymers is the copolymer consisting of three distinct monomers?
a) Terepolymer copolymer
b) Graft copolymer
c) Statistical copolymer
d) Star copolymer
Answer: a
Clarification: Copolymers copolymer consisting of three distinct monomers, are called as terepolymer copolymer as it is in star shape, as shown in below. This sequence will not change.

10. Which of the following is the condition for ideal copolymerization?
a) r₁r₂=1
b) r₁r₂=0
c) r₁=r₂
d) r₁=1
Answer: a
Clarification: The composition and structural type of the copolymer depend on the reactivity ratios r₁ and r₂ according to the Mayo–Lewis equation also called the copolymerization equation.
Ideal copolymerisation happens when chain radicals have equal preference to add one of the monomers over the other.

250+ TOP MCQs on Structure and Physical Properties and Answers

Organic Chemistry Interview Questions and Answers on “Structure and Physical Properties”.

1. Name the geometry of the central oxygen atom in the ozone molecule (O₃).
a) Trigonal planar
b) Linear
c) Tetrahedral
d) Pyramidal
Answer: a
Clarification: It forms a single bond with one oxygen atom, double bond with another oxygen atom and there exists one more non-bonded atom. Thus, it forms a trigonal planar structure.

2. In which molecule there is a complete linear arrangement of all atoms?
a) BF₃
b) NH₃
c) CO₂
d) CH₄
Answer: c
Clarification: BF₃ has trigonal planar structure, NH₃ has a trigonal bipyramidal structure, CH₄ has tetragonal structure and hence CO₂ is the one with linear structure.

3. Choose the incorrect option.
a) BrO₄ – tetrahedral
b) PF₃ – pyramidal
c) ClO₄ – tetrahedral
d) BeBr₂ – linear
Answer: b
Clarification: PF₃ has a trigonal pyramidal structure as it has three bonding pairs and one non-bonding pair.

4. Which among the following is not a physical property?
a) Melting point
b) Boiling point
c) Solubility
d) Reactivity
Answer: d
Clarification: Reactivity is a chemical property and it is not a physical property.

5. A crystalline solid possess which one of the following property?
a) Irregularity
b) Non- symmetric
c) Perfect geometric pattern
d) non- stability
Answer: c
Clarification: A crystalline solid is one which possesses perfect geometry, high stability, symmetric and regularly arranged.

6. Melting is process which can be stated by the below statements except?
a) Change from a highly disordered stated to an ordered state
b) Change from particles in crystal lattice to liquid state
c) Thermal energy of particles overcome the intercrystalline forces that hold them
d) Change from low temperature to high temperature
Answer: a
Clarification: Melting is a process which proceeds by changing from a highly ordered state to a disordered state.

7. Which among the following is not associated with intermolecular forces?
a) They hold neutral molecules
b) Non- electrostatic in nature
c) attraction of oppositely charged particles
d) dipole-dipole interaction and van der Waals forces
Answer: b
Clarification: Intermolecular forces are electrostatic in nature.

8. Which among the following statement is not true?
a) In liquid, particles are less regularly arranged and are free to move
b) Boiling involves breaking up of group of molecules in liquid
c) Boiling involves clubbing of oppositely charged ions
d) Thermal energy of particles overcome cohesive forces that hold them
Answer: c
Clarification: Boiling involves separation of oppositely charged ions and makes them as individual ions.

9. When one of the Hydrogen in Methane(CH₄) is replaced by a hydroxyl group, then structurally methane resembles?
a) Methanol
b) Ethanol
c) Water
d) Both methanol and water
Answer: d
Clarification: Like water, it is a liquid with boiling point which is abnormally high for a compound of its size and polarity.

10. Which among the following does not match with the term solubility?
a) The structural units get separated from each other
b) The ion-dipole bond is very strong
c) The spaces in between the structures are occupied by solvent molecules
d) The electrostatic attraction between the oppositely charged ions and their corresponding ends are called ion-dipole bond
Answer: b
Clarification: The bond is weak but in the aggregate they supply enough energy to overcome the interionic forces.

Organic Chemistry for Interviews,