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 $B r C H_{2} C H_{2} C O O H$
$B r C H_{2} C H_{2} C O O H$ is least acidic or has less $K_{a}$ i.e., dissociation constant. It is (a) due to lesser –I effect of Br than F and (b) Br atom further away form COOH group.

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Similar questions

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

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

25^{o} C,

(K_{a})

H A

(K_{b})

A^{-} .

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