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AIIMS2017ChemistryChemical Bonding and Molecular Structure

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.

Options

  1. AIf both assertion and reason are true and reason is the correct explanation of assertion.
  2. BIf both assertion and reason are true but reason is not the correct explanation of assertion.
  3. CIf assertion is true but reason is false.
  4. DIf both assertion and reason are false.

Correct answer

B. If both assertion and reason are true but reason is not the correct explanation of assertion.

Step-by-step solution

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.

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