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# Which of the following pairs of species will yield carbylamine?

$\begin {array} {1 1} (A)\;CH_3CH_2Br\: and\: KCN & \quad (B)\;C H_CH_2Br\: and \: NH_3(Excess) \\ (C)\;CH_3CH_2Br \: and \: AgCN & \quad (D)\;CH_3CH_2NH_2\: and\: HCHO \end {array}$

As $AgCN$ is covalent the attacking nucleophile is $NC^-$ and the product formed is isocynide which is otherwise called carbylamine
Ans : (C)