Question

Cylohexylamine and aniline can be distinguished by:

• A. Hinsberg test
• B. Carbylamine test
• C. Lassaigne test
• D. Azo dye test

Answer 1

The correct option is D Azo dye test

Cylohexylamine and aniline can be distinguished by Azo dye test.
Azo dye test is given aromatic amine only.
Cylohexylamine is aliphatic amine. It will not give Azo dye test.
Aniline is aromatic amine. It will give Azo dye test.
Aniline is diazotized and diazonium salt, on coupling reaction gives bright coloured azo dye.
$C_6{H}_5-N{H}_2\underset{273-278K}{\overset{NaN{O}_2/HCl}{\to }}{C}_6{H}_5-N_2^{+}C{l}^{-}\underset{O{H}^{-}}{\overset{C_6{H}_5-OH}{\to }}{C}_6{H}_5-N=N-C_6{H}_4-OH+HCl$