BHU PMT BHU PMT Solved Paper-2003

  • question_answer
    Which carbocation is most stable?

    A)  \[C{{H}_{3}}CH_{2}^{+}\]           

    B) \[CH_{3}^{+}\]

    C)  \[{{C}_{6}}{{H}_{5}}CH_{2}^{+}\]            

    D) \[C{{H}_{3}}C{{H}_{2}}CH_{2}^{+}\]

    Correct Answer: C

    Solution :

                     Key Idea: \[\because \]Cations are electron deficient species. \[\therefore \]Electron donating group increase their stability In\[{{C}_{6}}{{H}_{5}}C{{\overset{+}{\mathop{H}}\,}_{2}},\]the phenyl\[({{C}_{6}}{{H}_{5}})\] group behaves as electron rich group and donates electrons and stabilizes the cation \[({{C}_{6}}{{H}_{5}}\]group can behave as electron rich or electron deficient group depending upon nature of group with which it is attached)


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