Question:
Which from following compounds can be obtained by azo coupling reaction.
Which from following compounds can be obtained by azo coupling reaction.
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Azo coupling products always contain the $-N=N-$ (azo) group and are often dyes.
Updated On: Apr 26, 2026
- Benzenediazonium chloride
- Fluoroarene
- $\text{p-Hydroxyazobenzene}$
- $\text{N-Ethylbenzene sulfonamide}$
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The Correct Option is C
Solution and Explanation
Step 1: Concept
Azo coupling is a reaction between a diazonium salt and an electron-rich aromatic compound (like phenol or aniline) to form an azo compound ($Ar-N=N-Ar'$).
Step 2: Analysis
- (A) is the reactant for coupling. - (B) is formed via the Balz-Schiemann reaction. - (C) $\text{p-Hydroxyazobenzene}$ is a classic orange dye formed when benzenediazonium chloride reacts with phenol in alkaline medium.
Final Answer: (C)
Azo coupling is a reaction between a diazonium salt and an electron-rich aromatic compound (like phenol or aniline) to form an azo compound ($Ar-N=N-Ar'$).
Step 2: Analysis
- (A) is the reactant for coupling. - (B) is formed via the Balz-Schiemann reaction. - (C) $\text{p-Hydroxyazobenzene}$ is a classic orange dye formed when benzenediazonium chloride reacts with phenol in alkaline medium.
Final Answer: (C)
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