Which of the following is least reactive towa | vedclass

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(D) $S_N2$ mechanism involves a single-step attack of the nucleophile and departure of the leaving group.Reactivity towards $S_N2$ reaction depends on

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$(CH_3)_3C-Br$

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(D) $S_N2$ mechanism involves a single-step attack of the nucleophile and departure of the leaving group.Reactivity towards $S_N2$ reaction depends on steric hindrance at the $\alpha$-carbon.As the number of alkyl groups attached to the $\alpha$-carbon increases,steric hindrance increases,making the nucleophilic attack more difficult.The order of reactivity towards $S_N2$ is: $	ext{Primary} > 	ext{Secondary} > 	ext{Tertiary}$.In $(CH_3)_3C-Br$,the carbon attached to the bromine is a tertiary carbon,which is highly sterically hindered,making it the least reactive towards $S_N2$ reaction.

Which of the following is least reactive towards $S_N2$ reaction?

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