Increasing rate of S_{N}1 reaction in the following compounds is :


(a) 
(B)<(A)<(C)<(D) 
(b) 
(A)<(B)<(D)<(C) 
(c) 
(B)<(A)<(D)<(C) 
(d) 
(A)<(B)<(C)<(D) 
Increasing rate of S_{N}1 reaction in the following compounds is :


(a) 
(B)<(A)<(C)<(D) 
(b) 
(A)<(B)<(D)<(C) 
(c) 
(B)<(A)<(D)<(C) 
(d) 
(A)<(B)<(C)<(D) 
The rate of S_{N}1 is decided by the stability of carbocation formed in the rate determining step.
Carbocation (D) is most stable due to +R effect of CH_{3}0 group, (C) is stabilized by +I and +H effect of CH_{3} group; (B) is least stable due to –I effect of Me0 group. So increasing order of rate od s_{N}1 is (B)<(A)<(C)<(D)