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Question: Answered & Verified by Expert
The most stable carbocation, among the following is
ChemistryGeneral Organic ChemistryNEETNEET 2019 (Odisha)
Options:
  • A $\left(\mathrm{CH}_3\right)_3 \mathrm{C}-\stackrel{\oplus}{\mathrm{C}} \mathrm{H}-\mathrm{CH}_3$
  • B $\mathrm{CH}_3-\mathrm{CH}_2-\stackrel{\oplus}{\mathrm{C}} \mathrm{H}-\mathrm{CH}_2-\mathrm{CH}_3$
  • C $\mathrm{CH}_3-\stackrel{\oplus}{\mathrm{C}} \mathrm{H}-\mathrm{CH}_2-\mathrm{CH}_2-\mathrm{CH}_3$
  • D $\mathrm{CH}_3-\mathrm{CH}_2-\stackrel{\oplus}{\mathrm{C}} \mathrm{H}_2$
Solution:
1215 Upvotes Verified Answer
The correct answer is: $\mathrm{CH}_3-\stackrel{\oplus}{\mathrm{C}} \mathrm{H}-\mathrm{CH}_2-\mathrm{CH}_2-\mathrm{CH}_3$
$\mathrm{CH}_3 \stackrel{+}{\mathrm{C}} \mathrm{H} \mathrm{CH}_2 \mathrm{CH}_2 \mathrm{CH}_3$ is the most stable carbocation among the given carbocations. It is because the number of $\alpha$ - $\mathrm{H}$ atom attached to carbocation is maximum in $\mathrm{CH}_3 \stackrel{+}{\mathrm{C}} \mathrm{CH}_2 \mathrm{CH}_2 \mathrm{CH}_3$. Thus, it has maximum number of hyperconjugating structure hence, it is most stable.

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