Which one of the following is the strongest acid?

{C H}_{3} C O O H

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{C H}_{2} C l C O O H

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C H {C l}_{2} C O O H

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C {C l}_{3} C O O H

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Solution

The correct option is D $C {C l}_{3} C O O H$
Strong acid means weak conjugate base.
Strength of Conjugate base order: ${C C l}_{3} C O O^{-} < {C H C l}_{2} C O O^{-} < C H_{2} C l C O O^{-} < {C H}_{3} C O O^{-}$
So strongest acid is ${C C l}_{3} C O O^{-}$ .

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Which one of the following is the strongest acid ?

0.09 M H C I

0.09 M

C H C l_{2} C O O H

.1 M

C H_{3} C O O H

1

C H C l_{2} C O O H

1.25 \times 10^{- x}

x

K_{a}

C H_{3} C O O H = 10^{- 5}

p K_{a}

25^{o} C

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