Which of the following acids dissociates to the greatest extent in aqueous solution?

Tricholoroacitic acid

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Acitic acid

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Chloroacitic acid

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none

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Solution

The correct option is B Tricholoroacitic acid
Dissociation constants (pKa) of trichloroacetic acid is 0.66, dichloroacetic acid is 1.35, chloroacetic acid is 2.87, acetic acid is 4.756 in aqueous solution. The larger the value of pKa , the smaller the extent of dissociation at any given pH. Hence trichloroacetic acid (pKa = 0.66) dissociates to the greatest extent in aqueous solution.

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