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how nature of nucleophile decides SN1 or SN2 ?
Dear jee
The key difference between SN1 and SN2 is when the nucleophileparticipates: in the rate determining step in SN2, but after the rate determining step in SN1.Thus the course of the reaction can be controlled by the nature of the nucleophile. Thus, otherthings being equal, a strong nucleophile favors SN2, while a weak nucleophile favors SN1.Nucleophilicity depends on basicity, polarizability, and solvation. For the same series, anionsare better nucleophiles than their neutral counterparts ( i.e. OH- is better than H2O). In thesame series in protic solvents, increasing polarizability leads to increasing nucleophilicity,thus I- is a better nucleophile than F-.
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