Among the following acid which has the lowest $p K_{a}$ ?

C H_{3} C H_{2} C O O H

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

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H C O O H

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C H_{3} C O O H

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Solution

The correct option is B $H C O O H$
Acidity $\propto \frac{1}{p K_{a}} \propto \frac{1}{+ I - e f f e c t}$
Stronger the acid lower is the pK value. From the given acid HCOOH is the strongest acid as it do not have any +I group.
Option C is correct.

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