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Explain S(N) - 2 reaction mechanism ?...

Explain `S_(N) - 2` reaction mechanism ?

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The reaction between methyl alcohol and `OH^(-)` gives methanol and `Cl^(-)`. The rate of reaction depends on the concentration of both the reactants. Hence it is a nucleophilic second order substitution reaction.

* `OH^(-)` group which approaches the methyl group from the back side starts forming covalent bond with carbon atom.
* A transition state is reached in which carbon atom is simultaneously bonded to incoming nucleophile `(OH^(-))` and out going leaving group (Cl).
* As this transition state is unstable finally chlorine atom leaves as `Cl^(-)` ion and methyl alcohol is formed.
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