JEE Main & Advanced Chemistry Hydrocarbons / हाइड्रोकार्बन Question Bank Alkene

  • question_answer
    When isobutyl magnesium bromide in dry ether is treated with absolute ethyl alcohol, the products formed are [IIT-JEE 1995]

    A) \[\underset{C{{H}_{3}}\,\,\,\,\,\,}{\mathop{\underset{|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,}{\mathop{C{{H}_{3}}-CH-C{{H}_{2}}OH}}\,}}\,\] and \[C{{H}_{3}}C{{H}_{2}}MgBr\]

    B) \[\underset{C{{H}_{3}}\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,}{\mathop{\underset{|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,}{\mathop{C{{H}_{3}}-CH-C{{H}_{2}}-C{{H}_{2}}-C{{H}_{3}}}}\,}}\,\] and \[Mg(OH)Br\]

    C) \[\underset{C{{H}_{3}}\,}{\mathop{\underset{|\,\,\,\,\,\,\,\,\,}{\mathop{C{{H}_{3}}-CH-C{{H}_{3}}}}\,}}\,\] and \[C{{H}_{3}}-C{{H}_{2}}OMgBr\]

    D) \[\underset{C{{H}_{3}}}{\mathop{\underset{|\,\,\,\,\,\,}{\mathop{C{{H}_{3}}-CH-C{{H}_{3}}}}\,}}\,,C{{H}_{2}}=C{{H}_{2}}\] and \[Mg(OH)Br\]

    Correct Answer: C

    Solution :

    \[C{{H}_{3}}-\underset{\underset{\,\,\,C{{H}_{3}}}{\mathop{|\,\,\,\,\,\,}}\,}{\mathop{CH}}\,-C{{H}_{2}}-\xrightarrow{{}}\]\[\underset{\text{Isobutane}}{\mathop{C{{H}_{3}}-\underset{C{{H}_{3}}}{\mathop{\underset{|\,\,\,\,\,\,\,}{\mathop{CH}}\,}}\,\,-C{{H}_{3}}}}\,\,\,+\underset{\begin{smallmatrix}  \text{Ethoxy}\,\,\text{magnesium} \\  \,\,\,\,\,\,\,\,\,\,\text{bromide} \end{smallmatrix}}{\mathop{{{C}_{2}}{{H}_{5}}OMgBr}}\,\]


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