Question

Distinguish between ethanamine and n- ethylenethanmine

Answer 1

Azo-dye test can be used to distinguish ethylamine and aniline.

Azo-dye test: A dye is obtained when aromatic amines react with HNO2 (NaNO2 + dil.HCl) at 0-5°C, followed by a reaction with the alkaline solution of 2-naphthol. The dye is usually yellow, red, or orange in colour. Aliphatic amines give a brisk effervescence due to the evolution of N2 gas under similar conditions.

Reaction:

Ethylamine;

Aniline;

CH3CH2 – NH2 + HONO

C2H5OH + N2↑ + H2O