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JEE Main levelSingle correct optionDifficulty 2 of 3g1126

Which of the following carbocations is stabilised only by hyperconjugation and +I effect, with no resonance and no lone pair involvement?

A $C X_{6} H X_{5} - CH X_{2} X^{+}$
B $CH X_{3} - O - CH X_{2} X^{+}$
C $CH X_{2} = CH - CH X_{2} X^{+}$
D $(CH X_{3}) X_{3} C X^{+}$

Answer: D

(CH X_{3}) X_{3} C X^{+}

is stabilised by 9 alpha C-H bonds and +I of methyls. Benzyl and allyl cations are resonance stabilised through a pi system, and

CH X_{3} OCH X_{2} X^{+}

is stabilised by the oxygen lone pair (+M).

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