SN2 reaction is preceded by a two-step mechanism, are bimolecular reactions involve the formation of carbocation.
SN2 reactions are the reactions in which, in the first step, cleavage of bonds occurs. The bonds are break to produce a carbocation. The reaction involves the attacking of nucleophile.
Thus, the SN2 reaction are bimolecular reactions involve the formation of carbocation. A, B, and C.
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