Arrange the following carbocations in decreasing order of stability: Benzyl cation (I), Allyl cation (II), -Butyl cation (III), Methyl cation (IV).

Question

Arrange the following carbocations in decreasing order of stability: Benzyl cation (I), Allyl cation (II), $tert$ -Butyl cation (III), Methyl cation (IV).

Prashant Kotian · Accepted Answer

Correct answer: C. Benzyl and Allyl cations are highly stabilized by resonance. The -butyl cation is highly stabilized by 9 -hydrogens (hyperconjugation). All three are exceptionally stable compared to the methyl cation.

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