Chemistry - Nomenclature Question with Solution | TestHub

The order of leaving group ability in the following groups is
$\begin{array}{l}-\text{OAc}\hfill \\ \text{I}\hfill \end{array}\begin{array}{l}-\text{OMe}\hfill \\ \text{II}\hfill \end{array}\begin{array}{l}-{\text{OSO}}_2\text{Me}\hfill \\ \text{III}\hfill \end{array}\begin{array}{l}-{\text{OSO}}_2{\text{CF}}_3\hfill \\ \text{IV}\hfill \end{array}$