Question:

Benzene diazonium chloride on reaction with aniline in the presence of dilute hydrochloric acid gives :

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Diazonium coupling with aniline occurs at the para position of the activated ring (azo coupling) to give an azo dye.
Updated On: Nov 11, 2026
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The Correct Option is A

Solution and Explanation

Benzene diazonium chloride is an electrophile and aniline is an activated aromatic amine. In mildly acidic medium the electrophilic substitution (azo coupling) takes place at the para position of aniline.
Product: \(\mathrm{C_6H_5{-}N{=}N{-}C_6H_4{-}NH_2}\) (p-aminoazobenzene, a yellow dye).
Option (2) is the ortho isomer (minor), (3) is the diazoamino compound (N-coupling), and (4) is a biaryl, which is not formed.
Answer: (1) p-aminoazobenzene (4-(phenylazo)aniline)
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