What happens when $C H_{3} B r$ is treated with $K C N$ ?

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Solution

$C H_{3} B r$ is treated with KCN.
$R - X + K C N \to R - C N$
KCN being ionic in nature dissociates into $K^{+}$ and $C N^{-}$ . $C N^{-}$ being ambident nucleophile provides both carbon and nitrogen but attack takes place through carbon as $C - C$ bond is stronger than $C - N$ bond.
$C H_{3} B r + K C N \to C H_{3} - C N + K - B r$
It is a nucleophilic substitution reaction. the reaction takes place by $S N_{2}$ mechanism.

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