Which of the following reactions is an example of nucleophilic substitution reaction?

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

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R X + K O H \to R O H + K X

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R X + M g \to R M g X

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

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Solution

The correct option is B $R X + K O H \to R O H + K X$
$R - X + K O H \to R - O H + K X$
$X$ replaced by $O H$ group.

Reaction (a) is oxidative insertion
Reaction (c) is coupling reaction
Reaction (d) is reduction.

Thus, reaction in option (b) shows nucleophic substitution reaction.

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