JEE Main Chemistry question

Chemistry Amines JEE Main

[IIT 2011] Among the compounds given, the one that would form a brilliant coloured dye on treatment with NaNO₂/dil. HCl followed by addition to an alkaline solution of β-naphthol is

(A)*N,N*-Dimethylaniline
(B)*N*-Methylaniline
(C)*p*-ToluidineCorrect
(D)A phenylethyl (non-amine) side-chain compound

Answer: (C)

Solution

Azo-dye formation requires diazotisation (a **primary** aromatic amine + NaNO₂/HCl → diazonium salt) followed by coupling with an activated aromatic ring such as β-naphthoxide. Only

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Question ID VK-140035