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JEE Main & Advanced Chemistry Biomolecules / जैव-अणु Question Bank Carbohydrates

  • question_answer
    The reagent which forms crystalline osazone derivative when reacted with glucose, is    [CPMT 1990]

    A)                 Fehling solution               

    B)                 Phenylhydrazine

    C)                 Benedict solution            

    D)                 Hydroxylamine

    Correct Answer: B

    Solution :

               \[\begin{matrix}    \underset{|\,\,\,\,\,\,\,\,}{\mathop{CHO\,}}\,\,\,\,\,\,  \\    \underset{|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,}{\mathop{CHOH\,\,\,}}\,  \\    \underset{|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,}{\mathop{{{(CHOH)}_{3}}}}\,  \\    C{{H}_{2}}OH  \\ \end{matrix}\underset{\text{Warm}}{\mathop{\xrightarrow{N{{H}_{2}}NH{{C}_{6}}{{H}_{5}}}}}\,\underset{\text{Glucose phenylhydrazone}}{\mathop{\begin{matrix}    \underset{|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,}{\mathop{CH=N-NH{{C}_{6}}{{H}_{5}}}}\,  \\    \underset{|\,\,\,\,\,\,\,\,\,\,\,}{\mathop{CHOH}}\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,  \\    \underset{|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,}{\mathop{{{(CHOH)}_{3}}\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,}}\,  \\    C{{H}_{2}}OH\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,  \\ \end{matrix}}}\,\]\[\xrightarrow{N{{H}_{2}}NH{{C}_{6}}{{H}_{5}}}\begin{matrix}    \underset{|\,\,\,\,}{\mathop{CH}}\,=N-NH{{C}_{6}}{{H}_{5}}\,\,\,\,\,\,\,\,  \\    \underset{|\,\,\,\,\,\,\,\,\,\,\,}{\mathop{C=O}}\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,  \\    \underset{|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,}{\mathop{{{(CHOH)}_{3}}\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,}}\,  \\    C{{H}_{2}}OH\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,  \\ \end{matrix}\]\[\xrightarrow{N{{H}_{2}}NH{{C}_{6}}{{H}_{5}}}\begin{matrix}    \underset{|\,\,\,\,\,}{\mathop{CH}}\,=N-NH{{C}_{6}}{{H}_{5}}\,\,\,\,  \\    C=N-NH{{C}_{6}}{{H}_{5}}\,\,\,\,\,\,\,  \\    \overset{|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,}{\mathop{{{(CHOH)}_{3}}\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,}}\,  \\    \underset{\text{Glucosazone}\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,}{\mathop{\overset{|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,}{\mathop{C{{H}_{2}}OH\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,}}\,}}\,  \\ \end{matrix}\]\[+\,{{C}_{6}}{{H}_{5}}N{{H}_{2}}+N{{H}_{3}}\]


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