Identify the strongest acid amongst the followings.

Chloroacetic acid

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Aceteic acid

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Trichloroacetic acid

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Dichloroacetic acid

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Solution

The correct option is B Trichloroacetic acid
The increase in the acid strength of an acid depends on the number of electron with drawing groups. Greater the number of electron withdrawing groups, greater is the strength of acid.
Thus,
$C l_{3} C - C O O H T r i c h l o r o a c e t i c a c i d > C l_{2} C H - C O O H D i c h l o r o a c e t i c a c i d > C l C H_{2} - C O O H c h l o r o a c e t i c a c i d > C H_{3} C O O H A c e t i c a c i d$

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