Consider the following chlorides
(A)
The order of reactivity of `A,B,C` and `D` towards hydrolysis by `S_(N)1` mechanism is

Options

A. `C lt B lt A lt D`
B. `D lt C lt B lt A`
C. `D lt A lt B lt C`
D. `A lt B lt C lt D`

Answer

C

Explanation

The rate controlling step of `S_(N)1` mechanism is the formation of carbonation. Thus more stable the carbocation the faster the reaction. `CH_(3)O-` is a more powerful activator than `CH_(3)-`while `NO_(2)` is a deactivator. Thus, the order of stability of carbocations is

Thus the order of reactivity is `D lt A lt B lt C`