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

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

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The reaction is:
`CH_(3)Br + AqNaOH rightarrow CH_(3)OH + NaBr`
The nucleophile OH attacks from rear side of the bromide atom to gives a transition state in which C-O-H bond is partially formed and C-Br bond is partially broker.

First step is raet determining step.
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