JEE Main Chemistry question

Which of the following tests is used for detection of secondary amines? [MP PET 2003]

(A)Liebermann's nitroso testCorrect
(B)Lucas test
(C)Tollen's test
(D)Carbylamine reaction

Answer: (A)

Solution

A secondary amine reacts with nitrous acid to form an -nitrosoamine, which with Liebermann's reagent (phenol + conc. , or direct treatment then dilution) gives a characteristic colour change (green, turning red on dilution) —

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Question ID VK-150284