We can conceive of a stepwise version of the SN2 reaction consisting of a Lawis acid-base dissociation

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We can conceive of a stepwise version of the SN2 reaction consisting of a Lawis acid-base dissociation followed by a Lewis acid-base association. (Nuc:- = a nucleophile.)

CH3 : :I: Nuc-CH3 Nuc: CH, Nuc:

(a) Why should the stepwise process be slower than the concerted process?
(b) For what type of alkyl halide is the stepwise process likely to be observed?

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