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12th Class Chemistry Biomolecules / जैव-अणु Question Bank MCQs - Biomolecules

  • question_answer
    Glucose on reaction with Fehling’s solution gives

    A) cupric oxide

    B) cuprous oxide

    C) saccharic acid

    D) Both (b) and (c)

    Correct Answer: B

    Solution :

    [b]
    When glucose is treated with Fehling solution, then gluconic acid and cuprous oxide are formed.
    \[\underset{Glu\cos e}{\mathop{{{C}_{5}}{{H}_{11}}{{O}_{5}}CHO}}\,+\underset{\begin{smallmatrix}  (From \\  Fehling  \\  solution) \end{smallmatrix}}{\mathop{2CuO}}\,\xrightarrow{O{{H}^{-}}}\underset{Gluconic\,\,acid}{\mathop{{{C}_{5}}{{H}_{11}}{{O}_{5}}COOH}}\,+\underset{\begin{smallmatrix}  Cuprous \\  \,\,\,\,oxide  \\  red\,\,ppt.) \end{smallmatrix}}{\mathop{C{{u}_{2}}O}}\,\]


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