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Explain SN^2 mechanism ?...

Explain `SN^2` mechanism ?

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This type of reaction occuring in single step through the formation of a transition state. In this reaction nucleophilic attack the carbon atom 180° away from the halog.en atom i.e. is back side this leads to the formation of a transition state with partially formed C - OH bond and partially broken C - Br bond negative charge is share by both in coming nucleophile and the leaving group.
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