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Question 820009
JEE Chemistry · Hard

Amines: Coupling reaction MCQ

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Coupling reactionHardQuestion 820009

Question

Benzene diazonium chloride reacts with phenol in alkaline medium to give:
  1. A
    p-hydroxyazobenzene (orange azo dye)
    Correct
  2. B
    Benzene
  3. C
    Chlorobenzene
  4. D
    Phenol + N₂

Correct answer

p-hydroxyazobenzene (orange azo dye)

Explanation

Coupling reaction: C₆H₅N₂⁺ + C₆H₅OH (alkaline) → C₆H₅−N=N−C₆H₄OH (para) + H⁺. The azo dye has −N=N− (azo) linkage and is highly coloured. Para position is favoured due to −OH being ortho/para director.

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