In how many pairs the second compound re...

In how many pairs the second compound reacts faster than the first in `S_(N)` ! Reaction with `OH^(-)` ?
(i) (ii) `CH_(3)I, CH_(3)Br`
(iii) `(CH_(3))_(2) CBr, (CH_(3))_(2) HBr` (iv)
(v) `CH_(3)CI, (CH_(3))_(2) CHCI`

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Which compound in each of the following paris will react faster in SN^(2) reaction with HO^(o-) ? a. CH_(3)Br or CH_(3)I b. (CH_(3))_(3)CCl or CH_(3)Cl c. CH_(2) = CHBr or CH_(2) = CH - CH_(2)Br