JEE Main & Advanced Chemistry Hydrocarbons / हाइड्रोकार्बन Question Bank Alkene

  • question_answer
    In a reaction, if half of the double bond is broken and two new bonds are formed, this is a case of [AMU 1983; NCERT 1978; CPMT 1983]

    A) Elimination

    B) Addition

    C) Displacement

    D) Rearrangement

    Correct Answer: B

    Solution :

    e.g. \[C{{H}_{2}}=C{{H}_{2}}+B{{r}_{2}}\to \underset{\underset{Br\,\,\,\,}{\mathop{|\,\,\,\,\,\,\,\,\,}}\,\,\,\,\,\,\,\,\underset{Br\,\,\,\,}{\mathop{|\,\,\,\,\,\,\,\,\,}}\,}{\mathop{C{{H}_{2}}-C{{H}_{2}}}}\,\] Half of the double bond is broken. It means \[\pi \]bond is broken while sigma bond is retained also two new \[C-Br\] bonds are formed.


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