Arrange the following compound in the correct order of acidity:
$C H_{3} C H O$ , $C H_{3} C O O H$ , $C H_{3} O H$ , $C_{2} H_{6}$

II > I > III > IV

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IV > III> I > II

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IV> I > III > II

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II > III> I > IV

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Solution

The correct option is D II > III> I > IV
Acidic strength order is $C H_{3} C O O H > C H_{3} C H O > C H_{3} O H > C_{2} H_{6}$

In $C H_{3} C O O H$ and $C H_{3} C H O$ there is an inductive effect and delocalization of $π$ electrons which makes them more acidic. In $C H_{3} O H$ there is only inductive effect which makes it more acidic than $C_{2} H_{6}$ which is nonpolar.

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