250+ TOP MCQs on Halogenation and Its Types and Answers

Unit Processes Multiple Choice Questions on “Halogenation and Its Types”.

1. What is meant by Halogenation?
a) Introduction of Halogen atom
b) Removal of Halogen atom
c) Introduction & Removal of Halogen atom
d) None of the mentioned
Answer: a
Clarification: Halogenation is defined as the process where one or more halogen atoms are introduced into an organic compound.

2. Which one of the following is the most important halogen in terms of preparations?
a) Bromine
b) Chlorine
c) Iodine
d) Fluorine
Answer: b
Clarification: The chlorine derivatives, because of the greater economy in effecting their preparation, are by far the most important of the technical halogen compounds and for this reason are given primary consideration. Chlorine > Bromine > Iodine > Fluorine.

3. Which derivative is used for aerosol propellant?
a) Bromine
b) Chlorine
c) Iodine
d) Fluorine
Answer: d
Clarification: The fluorine derivatives is well established in the fields of refrigerants and aerosol propellants because of their stability and low boiling points.

4. Which derivative has pharmaceutical or dyeing properties?
a) Fluorine
b) Iodine
c) Bromine
d) Chlorine
Answer: c
Clarification: The bromine derivative sometimes has certain advantages because of the greater ease in effecting the replacement of this halogen in subsequent reactions or because it possesses certain pharmaceutical or dyeing properties.

5. In which of the following reaction is Halogenation involved?
a) Addition
b) Substitution
c) Replacement
d) All of the mentioned
Answer: d
Clarification: halogenations may involve reactions of (1) addition, (2) substitution, Le. of hydrogen, (3) replacement, i.e., of groups, for example, the hydroxyl or sulfonic acid group.

6. What is the formula of Benzotrichloride?
a) C₆H₅-CCl₃
b) C₆H₅-CHCl₂
c) C₆H₅-CH₂-Cl
d) C₆H₅-CH₃
Answer: a
Clarification: Benzotrichloride acts as a chlorinating agent, whose formula is C₆H₅-CCl₃.

7. Thionyl Chloride is not a chlorinating agent.
a) True
b) False
Answer: b
Clarification: Thionyl Chloride- SOCL₂ acts as a chlorinating agent.

8. Is there a difference between Sandmeyer and Gattermann reaction?
a) Difference reaction temperature
b) Difference in pressure condition
c) Difference in catalyst
d) All of the mentioned
Answer: c
Clarification: (HCl, Cu ) In Sandmeyer reaction : RN₂Cl + Cu₂Cl₂ ———> RCL + N₂ + Cu₂Cl₂ Gattermann reaction: RN₂CL ———–> RCl + N₂ .

9. Which one of the following is an Addition reaction?
a) CH₂=CH₂ + HBr 2-Br
b) CH₂=CH₂ + HBr —–> CH-Br-CH₂-Br
c) CH₂=CH₂ + Br₂ —–> CH₂-Br-CH₂-Br
d) All of the mentioned
Answer: c
Clarification: By adding Br₂ into CH₂=CH₂ it breaks down the double bond between the carbon atoms, thus forming CH₂-Br-CH₂-Br.

10. CH₃COOH + 2I ——-> CH₂ICOOH + HI. What ids the name of the following reaction?
a) Chlorination
b) Bromination
c) Iodination
d) Fluorination
Answer: c
Clarification: The following reaction is called iodination because of the addition of Iodine to the compound.