Question:
Which of the following reaction of diazonium salt involves retention of diazonium group?
Which of the following reaction of diazonium salt involves retention of diazonium group?
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Diazonium salts are often involved in reactions with phenol to form azo compounds, retaining the diazonium group.
Updated On: Jan 27, 2026
- Reaction with phenol
- Reaction with phosphinic acid
- Reaction with dilute sulfuric acid
- Reaction with HCl and Cu powder
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The Correct Option is A
Solution and Explanation
Step 1: Understanding diazonium salt reactions.
Diazonium salts can react with phenols to form azo compounds, retaining the diazonium group during the reaction. This reaction is known as diazotization.
Step 2: Analyzing the options.
(A) Reaction with phenol: Correct — This reaction involves the retention of the diazonium group in the final product (azo compound).
(B) Reaction with phosphinic acid: This reaction leads to the elimination of the diazonium group.
(C) Reaction with dilute sulfuric acid: This reaction typically leads to the elimination of the diazonium group.
(D) Reaction with HCl and Cu powder: This reaction also leads to the elimination of the diazonium group.
Step 3: Conclusion.
The correct answer is (A) Reaction with phenol.
Diazonium salts can react with phenols to form azo compounds, retaining the diazonium group during the reaction. This reaction is known as diazotization.
Step 2: Analyzing the options.
(A) Reaction with phenol: Correct — This reaction involves the retention of the diazonium group in the final product (azo compound).
(B) Reaction with phosphinic acid: This reaction leads to the elimination of the diazonium group.
(C) Reaction with dilute sulfuric acid: This reaction typically leads to the elimination of the diazonium group.
(D) Reaction with HCl and Cu powder: This reaction also leads to the elimination of the diazonium group.
Step 3: Conclusion.
The correct answer is (A) Reaction with phenol.
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