Q62 / 180 · JIPMER 2017 · Chemistry
The most stable carbonium ion among the following is
- A$\mathrm{C}_6 \mathrm{H}_5-\mathrm{CH}_2 \stackrel{+}{\mathrm{C}} \mathrm{H}_2$
- B$\mathrm{CH}_3 \stackrel{+}{\mathrm{C}} \mathrm{H}_2$
- Correct answerC$\mathrm{C}_6 \mathrm{H}_5-\stackrel{+}{\mathrm{C}}-\mathrm{C}_6 \mathrm{H}_5$
- D$\mathrm{C}_6 \mathrm{H}_5 \stackrel{+}{\mathrm{C}} \mathrm{H}_2$
Solution
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.
Hence, the correct answer is option: 'C'.