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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`

Text Solution

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(i) Since `l^(-)` ion is a better leaving group than Br-ion, therefore, `CH_(3)l` reacts faster `CH_(3)Br` in `S_(N)2` reaction with `OH^(-)`ion.
(ii) On steric grounds, `1^(@)` alkyl halides are more reactive than tert-alkyl halides in `S_(N)2` reactions Therefore, `CH_(3)Cl` will react at a faster rate than `(CH_(3))_(3)C Cl` in a `S_(N)2` reaction with `OH^(-)`ion.
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