Among the following acids, which has the lowest $p K_{a}$ value?

{C H}_{3} C O O H

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H C O O H

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{({C H}_{3})}_{2} C O O H

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{C H}_{3} {C H}_{2} C O O H

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Solution

The correct option is C $H C O O H$
Lowest $p k_{a} \to$ Highest $k_{a} \to$ High acididty.
As $R$ increases $\to$ Acidity decreases.
Where, $R$ is length of alkyl chain.
So, $H C O O H$ is more acidic and least value of $p k_{a}$

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