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# Substitution Reactions: $S_{N} 2$ Requirements

ORGO1-EIKXSK

Which of the following is NOT a characteristic of an $S_{N} 2$ reaction?

A

The reaction must involve a strong nucleophile.

B

The reaction is optimal in a polar aprotic solvent.

C

The reaction goes through a carbocation intermediate.

D

The reaction involves inversion of configuration for the electrophile.