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Q.

An amine is treated with HNO2 and subsequently further treated with a few drops of phenol and Conc.   H2 SO4. A blue-green color is developed by adding water. It changed to red by adding NaOH, it further changes to dark blue. The amine is?

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a

Aniline

b

N, N-methyl aniline

c

N-methyl aniline

d

O-methyl aniline

answer is B.

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Detailed Solution

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It is characteristic of a secondary amine, familiar as Lieberman’s nitroso amine test.

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