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NEET Chemistry NEET PYQ-Aldehydes Ketones

  • question_answer
    An organic compound X having molecular formula \[{{C}_{5}}{{H}_{10}}O\] yields phenyl hydrazone and gives negative response to the iodoform test and Tollen's test. It produces n-pentane on reduction. X could be [NEET 2015]

    A) pentanal

    B) 2-pentanone

    C) 3-pentanone

    D) n-amyl alcohol

    Correct Answer: C

    Solution :

    [c] Since, the compound X yeilds phenyl hydrazone and gives negative response to the iodoform test and Tollen's test, it must contain a C = O group but is neither a methyl ketone nor an aldehyde.
    The structure of X could be
    \[\underset{3-\text{pentanone}}{\mathop{C{{H}_{3}}-C{{H}_{2}}-\overset{\overset{\text{O}}{\mathop{|\,\,|}}\,}{\mathop{C}}\,-C{{H}_{2}}-C{{H}_{3}}}}\,\]having molecular formula \[{{C}_{5}}{{H}_{10}}O.\]


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