CMC Medical CMC-Medical Ludhiana Solved Paper-2009

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


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