Which of the following acids has the smallest dissociation constant?

C H_{3} C H F C O O H

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

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B r C H_{2} C H_{2} C O O H

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C H_{3} C H B r C O O H

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Solution

The correct option is C $B r C H_{2} C H_{2} C O O H$
$B r$ has less inductive effect than fluorine. With increase in distance, inductive effect diminishes. Hence, $B r C H_{2} C H_{2} C O O H$ is the least acidic among the four.

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C H_{3} C H F C O O H

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

B r C H_{2} C H_{2} C O O H

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25^{o} C,

(K_{a})

H A

(K_{b})

A^{-} .

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