Which of the following will give S_N2 reactio | vedclass

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(C) The rate of $S_N2$ reaction depends on the steric hindrance around the electrophilic carbon and the stability of the transition state.$1$. $S_N2$

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Phenacyl bromide $(C_6H_5COCH_2Br)$

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(C) The rate of $S_N2$ reaction depends on the steric hindrance around the electrophilic carbon and the stability of the transition state.$1$. $S_N2$ reactions are fastest for primary alkyl halides with minimal steric hindrance.$2$. Phenacyl bromide $(C_6H_5COCH_2Br)$ is a primary alkyl halide where the transition state is stabilized by the adjacent carbonyl group $(C=O)$ through resonance/conjugation with the developing negative charge on the nucleophile or by lowering the energy of the transition state via the electron-withdrawing effect of the carbonyl group.$3$. Benzyl bromide is also reactive,but phenacyl bromide is significantly more reactive in $S_N2$ reactions due to the strong electron-withdrawing nature of the carbonyl group which stabilizes the transition state.$4$. Comparing the options,phenacyl bromide $(C_6H_5COCH_2Br)$ shows the fastest rate for $S_N2$ reactions.

Which of the following will give $S_N2$ reaction at the fastest rate?

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