250+ TOP MCQs on Polyhalogen Derivatives and Answers [2024]

Organic Chemistry Multiple Choice Questions on “Polyhalogen Derivatives”.

1. What will be the product for the given reaction?
a) CCl₃CHO
b) C₆H₆Cl₆
c) C₆H₁₂Cl₆
d) C₆H₉Cl₂
Answer: b
Clarification: Benzyl hexachloride will be formed when Benzene reacts with chlorine in presence of U.V light.
C₆H₆ + 3Cl₂ + U.V light → C₆H₆Cl₆
Benzene BHC

2. The molecular formula of DDT has how many chlorine atoms?
a) 5 chlorine atoms
b) 2 chlorine atoms
c) 3 chlorine atoms
d) 4 chlorine atoms
Answer: a
Clarification: As we can in below molecular structure of DDT has 5 chlorine atoms.

3. What is the IUPAC name of chloroform?
a) Dichloromethane
b) Trichloromethane
c) Chloromethane
d) Carbon tetrachloride
Answer: b
Clarification: Chloroform, or trichloromethane, is an organic compound with formula CHCl₃. It is a colorless, sweet-smelling, dense liquid that is produced on a large scale as a precursor to PTFE.

4. Which among the following is true?
a) Freon does not initiate radical chain reactions in stratosphere
b) Iodoform initiates radical chain reactions in stratosphere
c) Freon initiates radical chain reactions in stratosphere
d) Chloroform initiates radical chain reactions in stratosphere
Answer: c
Clarification: Freon (Eg: CFCl₃– Freon11) does initiate radical chain reactions in stratosphere, which can upset the ozone layer.

5. CF_xCl_y [where x + y = 4], why these compounds are not used?
a) These are fluoro carbons
b) These are difficult to synthesise
c) They deplete ozone layer
d) These are very expensive
Answer: c
Clarification: CFC molecules are made up of chlorine, fluorine and carbon atoms and are extremely stable. This extreme stability allows CFC’s to slowly make their way into the stratosphere (most molecules decompose before they can cross into the stratosphere from the troposphere).

6. Which one of the following is the correct formula of methylene dichloride?
a) ClCH = CHCl
b) ClC ≡ CCl
c) CH₂Cl₂
d) CH₂(Cl) CH₂Cl
Answer: c
Clarification: As we can see below molecular diagram of methylene dichloride the correct molecular formula is CH₂Cl₂.

7. Central nervous system can be depressed by the use of which of the following?
a) Chloroform
b) Freon
c) Iodoform
d) DDT
Answer: a
Clarification: Acute chloroform intoxication can cause depression of the central nervous system and may lead to death from lethal arrhythmias or respiratory arrest. Thus, the organic solvent is no longer in clinical use as an anaesthetic, but still plays a role in cases of suicide, homicide or inhalation for psychotropic effects.

8. How Benzene hexachloride (BHC) is used?
a) Insecticides
b) Fertilizers
c) Anaesthetics
d) Antiseptics
Answer: a
Clarification: Benzene hexachloride. Benzene hexachloride (BHC), any of several stereoisomers of 1,2,3,4,5,6-hexachlorocyclohexane formed by the light-induced addition of chlorine to benzene. One of these isomers is an insecticide called lindane, or Gammexane.

9. Depletion of Ozone is believed to increase which of the following?
a) Population
b) Ultraviolet rays
c) Pollution
d) Greenery
Answer: b
Clarification: Ozone layer depletion increases the amount of UVB that reaches the Earth’s surface. Laboratory and epidemiological studies demonstrate that UVB causes non-melanoma skin cancer and plays a major role in malignant melanoma development.

10. Which is the correct formula of Freon-12?
a) CCl₂F₂
b) CClF₃
c) CHCl₂F
d) CCl₃F
Answer: a
Clarification: As we can see below molecular diagram of Freon-12, the correct molecular formula is CCl₂F₂.

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