MHT CET 2025 Chemistry question

Which from following compounds can be obtained by azo coupling reaction

(A)Benzenediazonium chloride
(B)Fluoroarene
(C)P-HydroxyazobenzeneCorrect
(D)N-Ethylbenzene sulfonamide

Answer: (C)

Solution

Azo coupling is the electrophilic substitution of an activated aromatic ring (phenol or aniline) by a diazonium ion. Benzenediazonium chloride with phenol in mild alkaline medium (pH 9-10) couples at the para position to give the azo dye p-hydroxyazobenzene, . Hence

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Question ID VK-102071