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JEE Main & Advanced Sample Paper JEE Main Sample Paper-6

  • question_answer
    Directions: Question No. 51 are Assertion- Reaction type. Each of these contains tow statements Statement I (Assertion), Statement II (Reason). Each of these questions also has four alternative choices, only on of which is correct. You have to select the correct choices from the codes a, b, c and d given below: 
    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.


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