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NEET Chemistry Biomolecules / जैव-अणु Question Bank Self Evaluation Test - Biomolecules

  • question_answer
    An organic compound with the formula \[{{C}_{6}}{{H}_{12}}{{O}_{6}}\]forms a yellow crystalline solid with phenylhydrazine and gives a mixture of sorbitol and mannitol when reduced with sodium. Which among the following could be the compound?

    A) fructose 

    B) glucose

    C) mannose           

    D) sucrose

    Correct Answer: A

    Solution :

    [a] Since the compound forms a yellow crystalline solid, i.e. osazone with phenylhydrazine, it may be an aldohexose or a ketohexose. Further, since on reduction, compound forms a mixture of sorbitol and mannitol, it must be a ketohexose, i.e. fructose. Recall that glucose on reduction gives only one alcohol glucitol (Sorbitol)


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