JEE MAIN - Chemistry (2011 - No. 14)

The strongest acid amongst the following compounds is :
HCOOH
CH3CH2CH(Cl)CO2H
ClCH2CH2CH2COOH
CH3COOH

Explanation

The electron withdrawing $$\left( { - {\rm I}} \right)$$ group $$ - Cl$$ withdraws electrons from $$O-H$$ bond and thus helps the cleavage of the $$O-H$$ bond releasing hydrogen as $${H^ + }.$$

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