JEE Main & Advanced Chemistry GOC Question Bank Structural and stereo isomerism

  • question_answer Which of the following may exist in enantiomorphs [CBSE PMT 1988]

    A) \[C{{H}_{3}}-\overset{C{{H}_{3}}\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,}{\mathop{\overset{|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,}{\mathop{CH-COOH\,}}\,}}\,\]

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

    C) \[C{{H}_{3}}-\overset{N{{H}_{2}}\,\,\,\,\,\,\,\,\,\,\,\,}{\mathop{\overset{|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,}{\mathop{CH-C{{H}_{3}}\,}}\,}}\,\]

    D) \[C{{H}_{3}}-C{{H}_{2}}-\overset{N{{H}_{2}}\,\,\,\,\,\,\,\,\,\,\,\,}{\mathop{\overset{|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,}{\mathop{CH-C{{H}_{3}}}}\,}}\,\]

    Correct Answer: D

    Solution :

    \[C{{H}_{3}}-C{{H}_{2}}-\underset{H\,\,\,\,\,\,\,\,\,}{\overset{N{{H}_{2}}}{\mathop{\underset{|\,\,\,\,\,\,\,\,\,\,\,}{\overset{|\,\,\,\,\,\,\,\,\,\,}{\mathop{{{C}^{*}}\,\,\,-\,}}}\,}}}\,C{{H}_{3}}\] Chiral centre is present. Hence, it exists as optical isomers or enantiomorphs.

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