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(B) $1$. The reaction of $C_2H_5-Br$ with $AgCN$ is a nucleophilic substitution reaction. Since $AgCN$ is a covalent compound,the nitrogen atom acts a

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$CH_3-CH_2-NH-CH_3$

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(B) $1$. The reaction of $C_2H_5-Br$ with $AgCN$ is a nucleophilic substitution reaction. Since $AgCN$ is a covalent compound,the nitrogen atom acts as the nucleophile,leading to the formation of an isocyanide (carbylamine).$C_2H_5-Br + AgCN \rightarrow C_2H_5-NC + AgBr$$2$. The product $A$ is ethyl isocyanide $(C_2H_5-NC)$.$3$. The catalytic hydrogenation of an isocyanide using $H_2/Ni$ results in the formation of a secondary amine.$C_2H_5-NC + 2H_2 \xrightarrow{Ni} C_2H_5-NH-CH_3$$4$. The product $B$ is $N$-methylethanamine $(CH_3-CH_2-NH-CH_3)$.

Consider the following sequence of reactions: $C_2H_5-Br$ $\xrightarrow{AgCN} A$ $\xrightarrow{H_2/Ni} B$. Product $B$ is:

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