This set of Unit Processes Multiple Choice Questions & Answers (MCQs) focuses 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
View Answer
Explanation: 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
View Answer
Explanation: 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
View Answer
Explanation: 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
View Answer
Explanation: 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
View Answer
Explanation: 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
View Answer
Explanation: Benzotrichloride acts as a chlorinating agent, whose formula is C6H5-CCl3.
7. Thionyl Chloride is not a chlorinating agent.
a) True
b) False
View Answer
Explanation: 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
View Answer
Explanation: (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 <----- CH3-CH2-Br
b) CH2=CH2 + HBr —–> CH-Br-CH2-Br
c) CH2=CH2 + Br2 —–> CH2-Br-CH2-Br
d) All of the mentioned
View Answer
Explanation: 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
View Answer
Explanation: The following reaction is called iodination because of the addition of Iodine to the compound.
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