Identify the strongest acid amongst the followings :

Options

A. Chloroacetic acid
B. Acetic acid
C. Trichloroacetic acid
D. Dichloroacetic acid

Answer

C

Explanation

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,
`underset("Trichloroacetic acid")(CH_(3)C-COOH)gtunderset("Dichloroacetic acid Chloroacetic acid Acetic acid")(Cl_(2)CH-COOHgtClCH_(2)-COOH)gtCH_(3)COOH`