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Consider the following anions. (I) CF(...

Consider the following anions.
(I) `CF_(3)-overset(O)overset(||)underset(O)underset(||)(S)-O^(-)` (II) `C_(6)H_(5)-overset(O)overset(||)underset(O)underset(||)(S)-O^(-)` (III) (IV) `CH_(3)-overset(O)overset(||)(C)-O^(-)`
When attached to `sp^(3)`-hybridized carbon, their leaving group ability in nucleophilic substitution reactions decreases in the order

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The `pK_(a)` value of their conjugated acids of these anions are:
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