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(A) An $S_{N}2$ reaction is a bimolecular nucleophilic substitution reaction that proceeds via a single-step concerted mechanism.It is favored by prim

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$CH_3Br + OH^- 	o CH_3OH + Br^-$

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(A) An $S_{N}2$ reaction is a bimolecular nucleophilic substitution reaction that proceeds via a single-step concerted mechanism.It is favored by primary alkyl halides due to minimal steric hindrance.Option $A$ involves methyl bromide $(CH_3Br)$,which is a primary substrate and highly reactive towards $S_{N}2$ mechanisms.Option $B$ is a secondary alkyl halide,which typically undergoes $S_{N}1$ or $S_{N}2$ depending on conditions,but $CH_3Br$ is the classic example of $S_{N}2$.Option $C$ is an elimination reaction.Option $D$ involves a tertiary alkyl halide,which undergoes $S_{N}1$ due to steric hindrance and carbocation stability.

Which of the following reactions is an example of an $S_{N}2$ reaction?

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