consider the following species, when attached to sp3 hybridized carbon, their leaving group ability in nucleophilic substitution reactions decreases in the order.
(I) CF3−O||S||O−O⊖
(II) C6H5−O||S||O−O⊖
(III) C6H5−O⊖
(IV) CH3−O||C−O⊖
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Solution
Leaving group ability depends upon stability of anions(more resonating structure on more electronegative atom is more stable).