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Question

Statement-I: pka1 of fumaric acid is more than maleic acid.
Because


Statement-II: Conjugate base of fumaric acid is stabilised by intramolecular H-bonding.

A
Statement-I is True, Statement-II is True ; Statement-II is a correct explanation for Statement-I
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B
Statement-I is True, Statement-II is True ; Statement-II is NOT a correct explanation for Statement-I
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C
Statement-I is True, Statement-II is False
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D
Statement-I is False, Statement-II is True
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Solution

The correct option is D Statement-I is True, Statement-II is False
Fumaric acid is trans-butenedioic acid and Maleic acid is cis-butenedioic acid. Maleic acid exhibits the intramolecular hydrogen bonding that is not possible in fumaric acid for geometric reasons. these intramolecular hydrogen bonds make it difficult to release hydrogen to act as an acid.

Thus, Statement-I is True, Statement-II is False

Hence, the correct option is C

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