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AMU Medical AMU Solved Paper-2012

  • question_answer
    The following reaction\[C{{H}_{3}}-\overset{\begin{smallmatrix}  H \\  | \end{smallmatrix}}{\mathop{\underset{\begin{smallmatrix}  | \\  C{{H}_{3}} \end{smallmatrix}}{\mathop{C}}\,}}\,-\overset{\begin{smallmatrix}  C{{H}_{3}} \\  | \end{smallmatrix}}{\mathop{\underset{\begin{smallmatrix}  | \\  X \end{smallmatrix}}{\mathop{C}}\,}}\,-C{{H}_{3}}\xrightarrow[\begin{smallmatrix}  KOH \\  -{{H}_{2}},-KBr \end{smallmatrix}]{Alcoholic}\]\[{{H}_{3}}C-\underset{\begin{smallmatrix}  | \\  C{{H}_{3}} \end{smallmatrix}}{\mathop{C}}\,=\overset{\begin{smallmatrix}  C{{H}_{3}} \\  | \end{smallmatrix}}{\mathop{C}}\,-C{{H}_{3}}\]is an example of

    A)  \[\alpha \]-elimination

    B)  \[\beta \]-elimination

    C)  Hofmann elimination

    D)  None of the above

    Correct Answer: B

    Solution :

                    \[C{{H}_{3}}-\overset{\begin{smallmatrix}  H \\  \left| \beta  \right. \end{smallmatrix}}{\mathop{\underset{\begin{smallmatrix}  | \\  C{{H}_{3}} \end{smallmatrix}}{\mathop{C}}\,}}\,-C-C{{H}_{3}}\xrightarrow[-{{H}_{2}}O,\,-KBr]{Alc.\,\,KOH}\]  \[{{H}_{3}}C-\underset{\begin{smallmatrix}  | \\  C{{H}_{3}} \end{smallmatrix}}{\mathop{C}}\,=\overset{\begin{smallmatrix}  C{{H}_{3}} \\  | \end{smallmatrix}}{\mathop{C}}\,-C{{H}_{3}}\] The above reaction is an example of \[\beta \]-elimination.


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