In S_{N}2 reaction,the carbon in the transiti | vedclass

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(B) In an $S_{N}2$ reaction,the nucleophile attacks the carbon atom from the side opposite to the leaving group.This leads to a transition state where

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Penta coordinated

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(B) In an $S_{N}2$ reaction,the nucleophile attacks the carbon atom from the side opposite to the leaving group.This leads to a transition state where the carbon atom is simultaneously bonded to the incoming nucleophile,the leaving group,and the three other substituents.As shown in the mechanism,the carbon atom is bonded to $5$ groups in the transition state,making it penta-coordinated.

In $S_{N}2$ reaction,the carbon in the transition state is

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