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

  • question_answer Which of the following compounds will exhibit cis-trans isomerism [Kerala PMT 2004]

    A) 2-butene

    B) 2-butyne

    C) 2-butanol

    D) Butanone

    E) Butanol

    Correct Answer: A

    Solution :

    \[\underset{\text{cis 2 butene}}{\mathop{\begin{matrix}    C{{H}_{3}}  \\    \ \ H  \\ \end{matrix}>C=C<\begin{matrix}    C{{H}_{3}}  \\    H\ \ \   \\ \end{matrix}}}\,\] \[\underset{\text{Trans 2 butene}}{\mathop{\begin{matrix}    C{{H}_{3}}  \\    \ \ H  \\ \end{matrix}>C=C<\begin{matrix}    H\ \ \,  \\    C{{H}_{3}}  \\ \end{matrix}}}\,\] Cis-trans isomerism shown by compound which have double or triple bond by which they restrict their rotation, since 2 butyne have no hydrogen on triple bonded carbon. \[C{{H}_{3}}-C\equiv \underset{\text{2 butyne}}{\mathop{C-C{{H}_{3}}}}\,\] [It does not show cis-trans]

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