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  4. The weakest among the following acids is

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Q. The weakest among the following acids is

KEAMKEAM 2018Aldehydes Ketones and Carboxylic Acids

Solution:

As $pK _{a}$ value of

$p K_{a}\left( CH _{3} COOH \right)=4.76$

$p K_{a}\left( CH _{2} Cl \cdot COOH \right)=2.75$

$p K_{a}\left( CCl _{3} COOH \right)=0.65$

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and more be the value of $p K_{a}$, weaker be the acid. Hence, peroxyacetic acid is the weakest acid.