Which of the following acids is most acidic?

C l_{2} C H C O O H

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C l C H_{2} C O O H

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C H_{3} C O O H

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C l_{3} C C O O H

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Solution

The correct option is D $C l_{3} C C O O H$
Presence of -I group chlorine atom increases the acidic nature by with drawing electrons.

$C l_{3} C C O O H > C l_{2} C H C O O H > C l C H_{2} C O O H > C H_{3} C O O H$
Trichloroacetic>Dichloro acetic acid>Monochloro acetic acid>Acetic acid

Hence, the most acidic will be $C l_{3} C C O O H$ as here three -I groups are there.

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