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AMU Medical AMU Solved Paper-1999

  • question_answer
    The compounds that will give an isomer of 2,2- dimethylpropane on catalytic hydrogenation are (1) \[C{{H}_{3}}CH=\underset{\begin{smallmatrix}  | \\  C{{H}_{3}} \end{smallmatrix}}{\mathop{C}}\,-C{{H}_{3}}\] (2) \[C{{H}_{3}}CH=CHC{{H}_{3}}\] (3) \[C{{H}_{3}}CH=CHC{{H}_{2}}C{{H}_{3}}\] (4) \[C{{H}_{3}}\underset{\begin{smallmatrix}  | \\  C{{H}_{3}} \end{smallmatrix}}{\mathop{C}}\,=\underset{\begin{smallmatrix}  | \\  C{{H}_{3}} \end{smallmatrix}}{\mathop{C}}\,-C{{H}_{3}}\]

    A)  1 and 4           

    B)  2 and 4

    C)  1 and 3           

    D)  1 and 2

    Correct Answer: C

    Solution :

    : Formula of 2, 2-dimethyl propane is \[{{H}_{3}}C-\underset{\begin{smallmatrix}  | \\  C{{H}_{3}} \end{smallmatrix}}{\overset{\begin{smallmatrix}  C{{H}_{3}} \\  | \end{smallmatrix}}{\mathop{C}}}\,-C{{H}_{3}}\] \[C{{H}_{3}}CH=\underset{\begin{smallmatrix}  | \\  C{{H}_{3}} \end{smallmatrix}}{\mathop{C}}\,-C{{H}_{3}}\]on catalytic hydrogenation will give\[C{{H}_{3}}CH-\underset{\begin{smallmatrix}  | \\  C{{H}_{3}} \end{smallmatrix}}{\mathop{CH}}\,-C{{H}_{3}}\]which is an isomer of 2, 2-dimethylpropane. Also,\[C{{H}_{3}}CH=CHC{{H}_{2}}C{{H}_{3}}\]will give an isomer of 2, 2-dimethyl propane on hydrogenation.


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