Amines

Amines

Question

Give a chemical test to distinguish between ethylamine and aniline.

Answer

Ethylamine and aniline can be distinguished from each other by the azo-dye test.
A dye is obtained when aniline (an aromatic amine) reacts with HNO2 (NaNO2 + dil.HCl) at 0-5°C, followed by a reaction with the alkaline solution of 2-naphthol.

Ethylamine (an aliphatic amine) gives a brisk effervescence due (to the evolution of N2 gas) under similar conditions.

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