Punjab Medical Punjab - MET Solved Paper-2009

  • question_answer
    Which of the following compounds shows optical isomerism?

    A) \[C{{H}_{3}}-CH-BrCOOH\]

    B) \[C{{H}_{2}}OHC{{H}_{2}}-COOH\]

    C) \[COOHCHBr-COOH\]

    D) \[C{{H}_{2}}Br-C{{H}_{2}}-COOH\]

    Correct Answer: A

    Solution :

    Optical isomerism is exhibited by asymmetric compounds. Compounds having chiral carbon atom are usually asymmetric and exhibit optical isomerism. \[C{{H}_{3}}\overset{*}{\mathop{C}}\,H(Br)COOH\], due to the presence of chiral carbon atom, exhibits optical isomerism. [\[\overset{*}{\mathop{C}}\,=\]chiral carbon, the carbon four valencies of which are attached with four different groups.]


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