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Which compound in the following pairs wi...

Which compound in the following pairs will react faster in `S_N^(2)` reaction?
(a). `CH_(3)Br` or `CH_(3)I`
(b). `(CH_(3))_(3)C Cl` or `CH_(3)Cl`

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Verified by Experts

(i) `CH_(3)I,` because iodides are more reactive than bromides.
(ii) `CH_(3)Cl` because `1^(@)` alkaly halides are more reactive than `3^(@)` alkyl halides in `SN_(2)` reaction.
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