What is the strongest acid ( $p K_{a}$ value is given)?

H C O O H [3.77]

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C_{6} H_{5} C O O H [4.22]

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{C H}_{3} C O O H [4.7]

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{C H}_{3} {C H}_{2} C O O H [4.88]

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Solution

The correct option is A $H C O O H [3.77]$
The $p K_{a}$ value indicates the strength of an acid. A lower $p K_{a}$ value indicates a stronger acid i.e, the lower value indicates the acid more fully dissociates in water.
$∴$ Formic acid with lower $p K_{a}$ value of $3.77$ is the strongest acid.

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