12th Class Chemistry Biomolecules / जैव-अणु Question Bank Assertion And Reason (MCQs) - Biomolecules

  • question_answer
    Assertion : Fructose reduces Fehling's solution and Tollens' reagent.
    Reason: Fructose does not contain any aldehyde group.

    A) Assertion and reason both are correct statements and reason is correct explanation for assertion.

    B) Assertion and reason both are correct statements but reason is not correct explanation for assertion.

    C) Assertion is correct statement but reason is wrong statement.

    D) Assertion is wrong statement but reason is correct statement.

    Correct Answer: B

    Solution :

    Fructose on warming with dilute alkali, gives rise to an equilibrium mixture of glucose, fructose and mannose. The ability of fructose to reduce Fehling solution and Tollens' reagent is probably due to the isomerisation of fructose to glucose and mannose (this is called Lobry de Bruyn and Elkenstein rearrangement).


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