The Carbylamine reaction (also known as the Hoffman isocyanide test) is a specific chemical test used to detect the presence of primary amines. When a primary amine is heated with chloroform ($\mathit{C}\mathit{H}\mathit{C}{\mathit{l}}_3$) and alcoholic potassium hydroxide (KOH), it produces an isocyanide (carbylamine), which is easily identified by its extremely foul, characteristic odor.
$\mathit{R}-\mathit{N}{\mathit{H}}_2+\mathit{C}\mathit{H}\mathit{C}{\mathit{l}}_3+3\mathit{K}\mathit{O}\mathit{H}\stackrel{∆}{\mathit{─}\mathit{─}\mathit{─}\mathit{─}\mathit{─}\mathit{─}\mathit{─}▶}\mathit{R}-\mathit{N}\mathit{C}+3\mathit{K}\mathit{C}\mathit{l}+3{\mathit{H}}_2\mathit{O}$
Therefore, the major product is Isocyanide.