JEE CHEMISTRY MCQ: ORGANIC CHEMISTRY-SOME BASIC PRINCIPLES AND TECHNIQUES

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Analyzing +4 | -1

Which is the correct order of stability of the following three carbonium ions?

\mathop {{\text{C}}{{\text{H}}_2} = {\text{CH}}\mathop {\text{C}}\limits^ + {{\text{H}}_3}}\limits_{\text{I}} ,\,\,\mathop {{\text{CH}} = \mathop {\text{C}}\limits^{\begin{array}{cccccccccccccccccccc} {{\text{C}}{{\text{H}}_3}} \\ {||} \end{array}} - {\text{C}}{{\text{H}}_2}}\limits_{{\text{II}}} ,\,\,\mathop {{\text{C}}{{\text{H}}_3}{\text{CH}} = {\text{CH}}\mathop {\text{C}}\limits^ + {{\text{H}}_2}}\limits_{{\text{III}}}

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Correct option: C

\approx

III

>

Option C is correct. Carbocations are stabilized by +I effect and delocalization. I and III are more stable than II due to more delocalization.

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