JEE Main & Advanced Chemistry GOC Question Bank Dipole moment, Resonance and reaction intermediates

  • question_answer Among the given cations, the most stable carbonium ion is [IIT-JEE 1981]

    A) sec-butyl

    B) ter-butyl

    C) n-butyl

    D) None of these

    Correct Answer: B

    Solution :

               \[\underset{\,\,\,\,\,\,\,\,\,{{3}^{o}}}{\mathop{C{{H}_{3}}-\underset{C{{H}_{3}}}{\overset{\,\,C{{H}_{3}}}{\mathop{\underset{|\,\,\,\,\,}{\overset{|\,\,\,\,}{\mathop{{{C}^{+}}\,}}}\,}}}\,>}}\,\,\underset{\,\,\,\,\,\,\,\,\,\,\,2{}^\circ }{\mathop{C{{H}_{3}}-\underset{C{{H}_{3}}}{\mathop{\underset{|\,\,\,\,\,\,}{\mathop{CH{{_{{}}^{{}}}^{+}}}}\,}}\,>}}\,\,\underset{\begin{matrix}    \begin{matrix}    {}  \\    \begin{matrix}    {}  \\    {{1}^{o}}  \\ \end{matrix}  \\ \end{matrix}  \\    \,\,\,\,\,\,\,\,\,\,\,\,\,\,  \\ \end{matrix}}{\mathop{C{{H}_{3}}-CH{{_{2}^{{}}}^{+}}}}\,>\underset{\begin{matrix}    {}  \\    \begin{matrix}    {}  \\    \begin{smallmatrix}  \text{Methyl } \\  \text{carbocation} \end{smallmatrix}  \\ \end{matrix}  \\ \end{matrix}}{\mathop{CH{{_{3}^{{}}}^{+}}\,\,\,\,\,\,\,}}\,\] Greater the no. of alkyl groups, greater would be the dispersal of the charge and hence more stable will be the carbonium ion.

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