Class 12 Chemistry MCQ – Diazonium Salts in Synthesis of Aromatic Compounds

This set of Class 12 Chemistry Chapter 13 Multiple Choice Questions & Answers (MCQs) focuses on “Diazonium Salts in Synthesis of Aromatic Compounds”.

1. Diazonium salts are specifically used as intermediates in the production of which of the following compounds?
a) m-Bromotoluene
b) o-Bromotoluene
c) p-Bromophenol
d) o-Bromophenol
View Answer

Answer: a
Explanation: m-Bromotoluene cannot be prepared from the direct bromination of toluene or by Friedel-Crafts alkylation of bromobenzene, because of the ortho, para directing nature of alkyl groups.

2. What is the minimum number of reactions required for the conversion of aniline to 1,3,5-tribromobenzene?
a) 2
b) 3
c) 4
d) 5
View Answer

Answer: b
Explanation: The three reactions are as follows:
\(\Rightarrow\) Reaction 1: Aniline on treatment with bromine water gives 2,4,6-tribromoaniline.
\(\Rightarrow\) Reaction 2: This on diazotisation with HNO2 gives 2,4,6-tribromobenzenediazonium chloride.
\(\Rightarrow\) Reaction 3: This on reaction with H3PO2, reduces the diazo group to hydrogen, to give 1,3,5-tribromobenzene.

3. p-Iodonitrobenzene can be synthesized from p-nitroaniline.
a) True
b) False
View Answer

Answer: a
Explanation: p-Nitroaniline on diazotisation gives p-nitrobenzenediazonium chloride with on treatment with potassium iodide replaces the N2+Cl group to give p-iodonitrobenzene.

4. Diazonium salts are used in which of the following industries?
a) Pharmaceutical
b) Dye
c) Photography
d) Food
View Answer

Answer: b
Explanation: Coupling reactions of diazonium salts produce azo compounds which are coloured in nature. This is used as an application in the manufacturing of dyes.

5. Diazonium salts are primarily used for the preparation of _______ substituted aromatic compounds.
a) alkyl
b) halogen
c) amino
View Answer

Answer: b
Explanation: Diazonium salts are important intermediates for the introduction of -F, -Cl, -Br, -I, etc. groups into an aromatic ring. Certain compounds like aryl fluorides and aryl iodides cannot be prepared by direct halogenation and are prepared from diazonium salts.
Note: Join free Sanfoundry classes at Telegram or Youtube

Sanfoundry Global Education & Learning Series – Chemistry – Class 12.

To practice all chapters and topics of class 12 Chemistry, here is complete set of 1000+ Multiple Choice Questions and Answers.


Subscribe to our Newsletters (Subject-wise). Participate in the Sanfoundry Certification contest to get free Certificate of Merit. Join our social networks below and stay updated with latest contests, videos, internships and jobs!

Youtube | Telegram | LinkedIn | Instagram | Facebook | Twitter | Pinterest
Manish Bhojasia - Founder & CTO at Sanfoundry
Manish Bhojasia, a technology veteran with 20+ years @ Cisco & Wipro, is Founder and CTO at Sanfoundry. He lives in Bangalore, and focuses on development of Linux Kernel, SAN Technologies, Advanced C, Data Structures & Alogrithms. Stay connected with him at LinkedIn.

Subscribe to his free Masterclasses at Youtube & discussions at Telegram SanfoundryClasses.