Which of the following carbocations is likely to rearrange?

Name: Which of the following carbocations is likely to rearrange?
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Question

Quizplus · Accepted Answer

Carbocations II and IV are both secondary carbocations, which are more stable than primary (I) or tertiary (III) carbocations. However, they are both adjacent to a hydrogen atom on a neighboring carbon, which could lead to a 1,2-hydride or 1,2-alkyl shift to form a more stable carbocation. Therefore, II and IV are likely to undergo rearrangement.

Which of the Following Carbocations Is Likely to Rearrange