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Which compound in each of the following ...

Which compound in each of the following pairs will react faster in `S_(N)2` reaction with `.^(–)OH` ?
(i) `CH_(3)Br or CH_(3)I , (ii) (CH_(3))_(3)C Cl or CH_(3)Cl`

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(a) `CH_(3)I` reacts faster than `CH_(3) Br` in `S_(N)2` reaction with `OH^(-)` because `I^(-)` ion is a better leaving group than `Br^(-)` ion
(b) `CH_(3)CI` is more reactive than `(CH_(3))_(3)C CI` because of steric hindrante in case of `(CH_(3))_(3)C CI`.
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