question_answer

In the following groups                 \[\begin{matrix}    -OAc  \\    \text{I}  \\ \end{matrix}\]  \[\begin{matrix}    -OMe  \\    \text{II}  \\ \end{matrix}\]  \[\begin{matrix}    -OS{{O}_{2}}Me  \\    \text{III}  \\ \end{matrix}\]  \[\begin{matrix}    -OS{{O}_{2}}C{{F}_{3}}  \\    \text{IV}  \\ \end{matrix}\]                 The order of leaving group ability is         [IIT 1997]

A)                 I > II > III > IV

B)                 IV > III > I > II

C)                 III > II > I > IV

D)                 II > III > IV > I