Which of the following is the correct order o | vedclass

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(C) In the $S_{N^{2}}$ mechanism,the transition state is pentavalent.Steric hindrance plays a crucial role in $S_{N^{2}}$ reactions.Bulky alkyl groups

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$RCH_2X > R_2CHX > R_3CX$

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(C) In the $S_{N^{2}}$ mechanism,the transition state is pentavalent.Steric hindrance plays a crucial role in $S_{N^{2}}$ reactions.Bulky alkyl groups hinder the approach of the nucleophile,while smaller alkyl groups facilitate it.Therefore,the reactivity order for $S_{N^{2}}$ is primary $(RCH_2X)$ > secondary $(R_2CHX)$ > tertiary $(R_3CX)$.The correct order is $RCH_2X > R_2CHX > R_3CX$.

Which of the following is the correct order of decreasing $S_{N^{2}}$ reactivity?
($X$ is a halogen)

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Which of the following is the correct order of decreasing $S_{N^{2}}$ reactivity?($X$ is a halogen)