Manipal Engineering Manipal Engineering Solved Paper-2008

  • question_answer
    Which of the following compound is expected to be optically active?

    A) \[{{(C{{H}_{3}})}_{2}}CHCHO\]

    B) \[C{{H}_{3}}C{{H}_{2}}C{{H}_{2}}CHO\]

    C) \[C{{H}_{3}}C{{H}_{2}}CHBrCHO\]

    D) \[C{{H}_{3}}C{{H}_{2}}CB{{r}_{2}}CHO\]

    Correct Answer: C

    Solution :

    Compounds having asymmetric C-atom \[(\overset{*}{\mathop{C}}\,)\] is optically active, eg,                 \[C{{H}_{3}}-C{{H}_{2}}{{-}^{*}}\underset{\begin{smallmatrix}  | \\  Br \end{smallmatrix}}{\overset{\begin{smallmatrix}  H \\  | \end{smallmatrix}}{\mathop{C}}}\,\_\,\,\,CHO\] The C-atom whose four valencies are satisfied by four different groups is asymmetric C-atom.


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