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JEE Main & Advanced Sample Paper JEE Main Sample Paper-42

  • question_answer
    \[X\xleftarrow[{{H}_{2}}S{{O}_{4}},{{H}_{2}}O]{HgS{{O}_{4}}}\]1-pentyne\[\xrightarrow[OH_{,}^{-}{{H}_{2}}{{O}_{2}}]{B{{H}_{3}},THF}Y\]X and V cannot be distinguished by

    A)  silver-mirror test         

    B)  io do form test

    C) \[N{{H}_{2}}OH\]               

    D) \[LiAl{{H}_{4}}\]

    Correct Answer: C

    Solution :

    X is\[C{{H}_{3}}-\overset{\begin{smallmatrix}  O \\  || \end{smallmatrix}}{\mathop{C}}\,-C{{H}_{2}}.C{{H}_{2}}-C{{H}_{3}}\]Y is\[OHC-C{{H}_{2}}-C{{H}_{2}}-C{{H}_{2}}C{{H}_{3}}\] Aldehyde and ketone can be distinguished by silver-mirror test, iodoform test and \[LiAl{{H}_{4}}\]but not by \[N{{H}_{2}}OH\](both give oximes).


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