Which carbocation would be most stable?

Name: Which carbocation would be most stable?
Brand: Quizplus
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Question

Quizplus · Accepted Answer

Carbocation III would be the most stable as it has the most substituted carbon. The more substituents a carbocation has, the more stable it is due to the decreased positive charge density on the central carbon atom. Carbocations I and II have only one substituent each, while carbocations IV and V have two substituents each. Thus, III is the most stable.

Which Carbocation Would Be Most Stable