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Arrange the following compounds in order of decreasing acidity : Cl OH (I) ; CH 3 OH (II) ; NO 2 OH (III) ; OCH 3 OH (IV)

1. III > I > II > IV
2. IV > III > I > II
3. II > IV > I > III
4. I > II > III > IV

Correct answer: III > I > II > IV

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