Which of the following acids has the smallest dissociation constant?
a) $C H_{3} C H F C O O H$
b) $F C H_{2} C H_{2} C O O H$
c) $B r C H_{2} C H_{2} C O O H$
d) $C H_{3} C H B r C O O H$

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Solution

Explanation: $B r C H_{2} C H_{2} C O O H$ is least acidic or has less Ka i.e., dissociation constant. It is A due to lesser $- I$ effect of $B r$ than $F$ and B Br atom further away form $- C O O H$ group.

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