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Question: Answered & Verified by Expert
The most stable carbonium ion among the following is
ChemistryGeneral Organic ChemistryJIPMERJIPMER 2017
Options:
  • A $\mathrm{C}_6 \mathrm{H}_5-\mathrm{CH}_2 \stackrel{+}{\mathrm{C}} \mathrm{H}_2$
  • B $\mathrm{CH}_3 \stackrel{+}{\mathrm{C}} \mathrm{H}_2$
  • C $\mathrm{C}_6 \mathrm{H}_5-\stackrel{+}{\mathrm{C}}-\mathrm{C}_6 \mathrm{H}_5$
  • D $\mathrm{C}_6 \mathrm{H}_5 \stackrel{+}{\mathrm{C}} \mathrm{H}_2$
Solution:
2491 Upvotes Verified Answer
The correct answer is: $\mathrm{C}_6 \mathrm{H}_5-\stackrel{+}{\mathrm{C}}-\mathrm{C}_6 \mathrm{H}_5$
Due to more possibility for delocalisation in
$\mathrm{C}_6 \mathrm{H}_5-\stackrel{+}{\mathrm{C}}-\mathrm{C}_6 \mathrm{H}_5$ (of $\pi$-electrons),
$\mathrm{C}_6 \mathrm{H}_5-\stackrel{+}{\mathrm{C}}-\mathrm{C}_6 \mathrm{H}_5$ is the most stable ion.

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