In the following carbocation, $\mathrm{H} / \mathrm{CH}_3$ that is most likely to migrate to the positively…

In the following carbocation, $\mathrm{H} / \mathrm{CH}_3$ that is most likely to migrate to the positively charged carbon is
  1. $\mathrm{CH}_3$ at $\mathrm{C}-4$
  2. $\mathrm{H}$ at $\mathrm{C}-4$
  3. $\mathrm{CH}_3$ at $\mathrm{C}-2$
  4. $\mathrm{H}$ at $\mathrm{C}-2$

Solution

Hydride shift from $\mathrm{C}-2$ will give most stable resonance stabilised carbocation as Fig.

Asked in: JEE Advanced 2009 (Paper 2)

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