The correct order of reactivity of following compounds in nucleophilic substitution reaction is
(i) `CH_(3)Br` (ii) `CH_(3)Cl`
A. (i) gt (ii) gt (iii) gt (iv)
B. (iv) gt (iii) gt (ii) gt (i)
C. (iv) gt (i) gt (ii) gt (iii)
D. (iii) gt (iv) gt (ii) gt (i)