BCECE Engineering BCECE Engineering Solved Paper-2013

  • question_answer
    Relative  stabilities  of the  following carbocation will be in order
    I   
    II
    III   
    IV \[C{{H}_{3}}\overset{\oplus }{\mathop{C}}\,{{H}_{2}}\]

    A) IV < III < II < I    

    B)        IV < II < III < I     

    C)        II < IV < III < I    

    D)        I < II < III < IV

    Correct Answer: B

    Solution :

    Benzyl carbocation is more stable then alkyl\[(C{{H}_{3}}\overset{\oplus }{\mathop{C{{H}_{2}}}}\,).C{{H}_{3}}O-\]and \[C{{H}_{3}}-,\]both stabilize Benzyl carbocation and among them \[C{{H}_{3}}O-\]is more stable then \[C{{H}_{3}}-,\]Thus, correct order of stabilities will be IV < II < III < I


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