Explain Hinsberg test for amines.

Give a chemical test for primary amines.

Distinguish between the following two compounds by a chemical reaction:

${\mathrm{C}}_6{\mathrm{H}}_5{\mathrm{NH}}_2$ and ${\mathrm{C}}_6{\mathrm{H}}_5{\mathrm{NHCH}}_3$.

The following reaction constitutes :

${\text{RNH}}_2+\text{S}=\text{C}=\text{S}\underset{{\text{H}}_2\text{S}}{\overset{{\text{HgCl}}_2}{\to }}\underset{\text{Alkyl isothiocyanate}}{R-\text{N}=\text{C}=\text{S}}+{\text{H}}_2\text{S}$

During the Hinsberg's Test, which of the following primary amine is most likely to be detected as a secondary amine?

The following reaction constitutes :