Action of alcoholic caustic potash on chloroform and aniline forms a bad-smelling compound phenyl isocyanide.

${\mathrm{C}}_6{\mathrm{H}}_5\mathrm{N}{\mathrm{H}}_2+\mathrm{C}\mathrm{H}\mathrm{C}{\mathrm{l}}_3+3\mathrm{K}\mathrm{O}\mathrm{H}\left(\mathrm{alcohol}\right)\to {\mathrm{C}}_6{\mathrm{H}}_5\mathrm{N}\mathrm{C}+3\mathrm{K}\mathrm{C}\mathrm{l}+3{\mathrm{H}}_2\mathrm{O}$

This reaction is called carbylamine reaction and it is actually the test of primary amines.