Question

In the following carbocation, the migration of $H^{-}/{CH}_3^{-}$ to the positively charged carbon is the most difficult for:

• A. ${CH}_{3}atC-4$
• B. $HatC-4$
• C. ${CH}_{3}atC-2$
• D. $HatC-2$

Answer 1

The correct option is A ${CH}_{3}atC-4$

If the migration of $H-/{CH}_3-$ leads to the formation of a state carbocation, it forms the carbocation easily.

At 2nd carbon, carbocation is stable due to resonance.

Hence, ${CH}_3$ at $C-4$ is the least stable.