1* SN1 reaction are faster in the more polar solvant. 2* SN2 reaction involving a negetive nucleophile is slower in more polar solvant & solvant that involving neutral nucleophile is faster in more polar solvant. 3* In addition to these polarity effects, the ability of certain solvants to form hydrogen bonds to the nucleophile also affects the rate of SN2 rection. Such solvants are termed asprotic solvants & have hydrogen bonded to nitrogen or oxygen ( e.g H2O, R-OH are protic solvants.) Especially smaller anaonic nucleophiles are strongly bonded to the solvant molecule in protic solvants. This make nucleophile less reactive Aprotic solvants (acetone) increses reactivity of .nucleophiles & are favarable of SN2 reactions because they can't hav hydrogen bond to nucleophile.
Moderation Team
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