Which of the following will have highest value of $p K a$ ?

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

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C H_{3} C H (F) - C O O H

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C H_{3} C H (B r) - C O O H

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

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Solution

The correct option is D $C H_{3} C H_{2} C O O H$
Acidic character $\propto$ $\frac{1}{p K_{a}}$

$C H_{3} C H_{2} C O O H$ will have highest value of pKa.

Others have electronegative halogen atom on alpha or beta carbon atom which increases the acidity and decreases the pKa value.

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Similar questions

C H_{3} C O O H

C H \equiv C - C O O H; C H_{2} = C H - C O O H; C H_{3} C H_{2} C O O H

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

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

H C \equiv C - C O O H

C l C H_{2} C O O H, C H_{3} C H_{2} C O O H, C l C H_{2} C H_{3} C O O H, (C H_{3})_{2} C H C O O H

C H_{3} C O O H

p K_{a}

25^{o} C

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