Which of the following reactions show nucleophillic substitution of alkyl halide?

R - X + H_{2} \to R H + H X

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R - X + K C N \to R C N + K X

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2 R - X + 2 N a \to R - R + 2 N a X

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R - X + M g \to R M g X

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Solution

The correct option is A $R - X + K C N \to R C N + K X$
Among all given reactions, $X^{-}$ nucleophile is replaced by other nucleophile in this reaction only.
$R - X + K C N \to R C N + K X$ , here $X^{-}$ is replaced by $C N^{-}$ .

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R - X + M g \to R M g X

In the nucleophilic substitution reaction in alkyl halides (R-X) , the nucleophile replaces:

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R^{'} - X

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R X + 2 N a + X R \to R - R + 2 N a X

R - O H + H X \to R - X + H_{2} O

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