Assertion: The second dissociation constant of fumaric acid is greater than maleic acid. Reason : Higher the dissociation constant of acid, more is the acidic character.

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TestHub · Accepted Answer

Both fumaric and maleic acids have two ionisable H + ions i.e., protons. The maleate monoanion shows intramolecular H -bonding, whereas fumarate monoanion shows intermolecular H -bonding. Thus, fumarate monoanion requires more energy to give fumarate dianion. Hence, second dissociation of fumaric acid is more than that of maleic acid.

Chemistry - CHEMICAL BONDING Question with Solution | TestHub

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