Among the following, which is the strongest acid?

C H F_{2} - C H_{2} - C H_{2} - C O O H

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

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C H_{2} F - C H F - C H_{2} - C O O H

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

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Solution

The correct option is B $C H_{3} - C H_{2} - C F_{2} - C O O H$
$F$ is highly electron negative and withdraws electron density from the neighboring atoms.

The effectiveness increases with decrease in the distance between acidic $H$ of $- C O O H$ group and $F$ .

Hence $C H_{3} - C H_{2} - C F_{2} - C O O H$ is the most acidic because $F$ is nearest to the acidic $H$ .

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