The strongest acid

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Question:
The strongest acid amongst the following compounds is ?

$\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{CH}(\mathrm{Cl}) \mathrm{CO}_{2} \mathrm{H}$
$\mathrm{ClCH}_{2} \mathrm{CH}_{2} \mathrm{CH}_{2} \mathrm{COOH}$
$\mathrm{CH}_{3} \mathrm{COOH}$
$\mathrm{HCOOH}$

Correct Option: 1

Solution: