0环+ Key Notes Nucleophilic Substitution ●SN1 ●SN2 ■Elimination(E1,E2) ■Nucleophilicity .The rate of the SN2 reaction increases with the nucleophilic strength of the incoming nucleophile. OThe rate of the SN1 reaction is unaffected by the nature of the nucleophile ■Leaving groupKey Notes Nucleophilic Substitution SN1 SN2 Elimination（E1，E2） Nucleophilicity The rate of the SN2 reaction increases with the nucleophilic strength of the incoming nucleophile. The rate of the SN1 reaction is unaffected by the nature of the nucleophile Leaving group