Sat September 17, 2011 By: Prathu Sharma

what determines the rate of reaction of SN2 and SN! reactions?

Expert Reply
Mon September 19, 2011
In SN1 reaction formation of carbocation is the rate determinig step. Greater the stability of carbocations more easily it is formed and faster is the rate of reaction.he stability of carbocation decreases in order :
3 degree (tertiary) carbocation > 2 degree (secondary) carocation > 1 degree (primary) carbocation > methyl carbocation
In SN2 reaction there is no carbocation intermediate formation ,the rate of reaction is determined by the first step of simuntaneously bond breaking and bond formation by a nucleophile, as nucleophile is involved in the rate-determining step of SN2 reactions, stronger nucleophiles react faster
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