KI in acetone, undergoes `S_(N)2` reaction with each of `P,Q ,R` and S The rates of the reaction very as `underset(P)(H_(3)C-Cl)

KI in acetone, undergoes `S_(N)2` reaction with each of `P,Q ,R` and S The rates of the reaction very as
`underset(P)(H_(3)C-Cl)`

.
A. `P gt Q gt R gt S`
B. `S gt P gt R gt Q`
C. `P gt R gt Q gt S`
D. `R gt P gt S gt Q`

KI in acetone, undergoes `S_(N)2` reaction with each of `P,Q ,R` and S The rates of the reaction very as `underset(P)(H_(3)C-Cl)` .