Statement I: The second dissociation constant of maleic acid is greater than fumaric acid. |
Statement II: Higher the dissociation constant of acid, more is the acidic character. |
A) Statement I is true; Statement B is true; Statement B is not a correct explanation for Statement I,
B) Statement I is true; Statement II is false.
C) Statement I is false; Statement II is true.
D) Statement I is true; Statement II is true; Statements is the correct explanation for Statement I.
Correct Answer: C
Solution :
Both fumaric and maleic acids have two ionisable \[{{\text{H}}^{\text{+}}}\] ie, protons. The maleate mono anion shows intra molecular H-bonding and thus, requires more energy to give maleate dianion. Therefore, the second dissociation constant of fumaric add is more than maleic add. Since, former does not show intra molecular H-bonding.You need to login to perform this action.
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