Primary amines react with alcoholic alkali and chloroform to give an offensive odour compound i.e., isocyanide. This reaction is called carbylamines reaction.

This is carbylamines reaction.

$\text{C}{\text{H}}_3\text{C}{\text{H}}_2\text{N}{\text{H}}_2+\text{C}\text{H}\text{C}{\text{l}}_3+3\text{K}\text{O}\text{H}\underset{}{\overset{}{\to }}\underset{\begin{array}{l}(\text{e}\text{t}\text{h}\text{y}\text{l}\\ \text{i}\text{s}\text{o}\text{c}\text{y}\text{a}\text{n}\text{i}\text{d}\text{e})\\ (\text{A})\end{array}}{{\text{C}}_2{\text{H}}_5\text{N}\text{C}}+\underset{\begin{array}{l}(\text{P}\text{o}\text{t}\text{a}\text{s}\text{s}\text{i}\text{u}\text{m}\\ \text{c}\text{h}\text{l}\text{o}\text{r}\text{i}\text{d}\text{e})\\ (\text{B})\end{array}}{3\text{K}\text{C}\text{l}}+3{\text{H}}_2\text{O}$