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Which one is more reactive in nucleophil...

Which one is more reactive in nucleophilic acyl substituion. Why is it so ?
`F_(3)C-overset(O)overset(||)(C)-O-C_(2)H_(5) ` or `H_(3)C-overset(O)overset(||)(C)-O-C_(2)H_(5)`

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`F_(3)C-overset(O)overset(||)(C)-O-C_(2)H_(5)` is more reactive than `H_(3)C-overset(O)overset(||)(C)-O-C_(2)H_(5)` in nucleophilic acyl substituion. The electron withdrawing `CF_(3)` group polarizes the carbony carbon.
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