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In the following groups -OAc (I) -OMe (II) - OSO2Me (III) -OSO2CF3 (IV) the order of leaving group ability is

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In the following groups

-OAc (I)

-OMe (II)

- OSO2Me (III)

-OSO2CF3 (IV)

the order of leaving group ability is

(a) I > II > III > IV

(b) IV > III > I > II

(c) III > II > I > IV

(d) II > III > IV > I

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Correct answer: (b) IV > III > I > II

Explanation:

The more the electrons withdrawing groups attached to - O atom, the more is the ease of leaving.

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