JEE Main Chemistry question

Aniline, when diazotised in the cold (NaNO₂/HCl, 278 K) and then treated with *N,N*-dimethylaniline, gives a coloured compound. Its structure would be

(A)A *p*-(dimethylamino)azobenzene-type dye, Ph–N=N–C₆H₄–N(CH₃)₂ (*para*-coupled)Correct
(B)An *ortho*-coupled isomer of the same azo dye
(C)A bis-coupled (disubstituted) azo product
(D)An *N*-coupled (triazene) product

Answer: (A)

Solution

Benzenediazonium chloride is an electrophile that couples with the strongly activated, electron-rich *N,N*-dimethylaniline ring at its *para*

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Question ID VK-140082