JEE Main & Advanced Chemistry Chemical Bonding and Molecular Structure Question Bank Resonance

  • question_answer The enolic form of acetone contains [IIT 1990; Bihar MEE 1997]

    A)                 9 sigma bonds, 1 pi bond and 2 lone pairs

    B)                 8 sigma bonds, 2 pi bonds and 2 lone pairs

    C)                 10 sigma bonds, 1 pi bond and 1 lone pair

    D)                 9 sigma bonds, 2 pi bonds and 1 lone pair

    Correct Answer: A

    Solution :

                    \[\,C{{H}_{3}}-\overset{\overset{_{\bullet }^{\bullet }\overset{\bullet \ \ \bullet }{\mathop{O}}\,-H\,\,\,\,\,\,\,}{\mathop{|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,}}\,}{\mathop{C=\,C{{H}_{2}}\,}}\,\] has 9s, 1p and 2 lone pairs.


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