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JEE Main & Advanced Sample Paper JEE Main Sample Paper-22

  • question_answer
    In the following conversion \[C{{H}_{3}}-\overset{\begin{smallmatrix}  O \\  || \end{smallmatrix}}{\mathop{C}}\,-C{{H}_{3}}\xrightarrow{X}C{{H}_{3}}-\overset{\begin{smallmatrix}  OH \\  | \end{smallmatrix}}{\mathop{C-C{{H}_{3}}}}\,\xrightarrow{Y}C{{H}_{3}}-C=C{{H}_{2}}\]Identify \[X\] and \[Y.\]

    A)  \[{{K}_{2}}C{{r}_{2}}{{O}_{7}}\backslash {{H}_{2}}S{{O}_{2}}\]  dil. NaOH

    B)  \[LiAl{{H}_{4}}\]                     di LHCl

    C)  \[Zn-Hg,\text{ }HCI\]                 Cone. \[{{H}_{2}}S{{O}_{4}}\]

    D)  \[NaB{{H}_{4}},C{{H}_{3}}OH\]        Cone. \[{{H}_{2}}S{{O}_{4}}\]

    Correct Answer: D

    Solution :

    \[C{{H}_{3}}\,-\overset{\begin{smallmatrix}  OH \\  \,\,\,\,\,\,\,| \end{smallmatrix}}{\mathop{C}}\,-C{{H}_{3}}\xrightarrow[C{{H}_{4}}OH]{NaB{{H}_{4}}}\,C{{H}_{3}}-\overset{\begin{smallmatrix}  OH \\  \,\,\,\,\,\,\,| \end{smallmatrix}}{\mathop{C}}\,-C{{H}_{3}}\xrightarrow[Dehydration]{Conc.\,{{H}_{2}}S{{O}_{4}}}\]\[C{{H}_{3}}-CH=C{{H}_{2}}\]


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