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(A) $1$. The reaction of alkyl halides $(RX)$ with $AgCN$ is a nucleophilic substitution reaction.$2$. $AgCN$ is a covalent compound. The carbon atom

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$AgCN$ (alcoholic)

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(A) $1$. The reaction of alkyl halides $(RX)$ with $AgCN$ is a nucleophilic substitution reaction.$2$. $AgCN$ is a covalent compound. The carbon atom in $AgCN$ is not free to act as a nucleophile, but the nitrogen atom has a lone pair of electrons available for bonding.$3$. Therefore, the nitrogen atom attacks the alkyl group, leading to the formation of alkyl isocyanides $(R-NC)$.$4$. In contrast, $KCN$ is an ionic compound that provides $CN^-$ ions, where the carbon atom acts as the nucleophile, leading to the formation of alkyl cyanides $(R-CN)$.

Which of the following reagents is used to prepare alkyl isocyanides from alkyl halides $(RX)$?

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