JEE Main Chemistry question

Aniline and methylamine can be differentiated by

(A)Diazotisation followed by coupling with phenolCorrect
(B)Reaction with chloroform and aqueous KOH (carbylamine test — both are primary amines and both give this test)
(C)Reaction with HNO₂ (both primary amines react, though the aromatic diazonium salt is far more stable)
(D)None of the above

Answer: (A)

Solution

Both are primary amines and both give a positive carbylamine test, so that test cannot distinguish them. However, on diazotisation in cold dilute acid, aniline's aromatic diazonium salt is stable enough to be isolated and

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Question ID VK-140304