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.

Question

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. (A) If both assertion and reason are true and reason is the correct explanation of assertion (B) If both assertion and reason are true but reason is not the correct explanation of assertion (C) If assertion is true but reason is false (D) If both assertion and reason are false

Tardigrade Admin · 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 .

Q. 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.

If both assertion and reason are true and reason is the correct explanation of assertion

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

If assertion is true but reason is false

If both assertion and reason are false

Q. 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.