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Question
Which carbocation is the most stable?
Which carbocation is the most stable?
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Solution
The correct option is B
Structure in option A is stabilized only by hyperconjugation.
Structure in option C is vinylic carbocation, which is the least stable.
In option B and D , the carbocations are resonance stabilized as well as stabilized by hyperconjugation.
Since resonance is more predominant effect in determining stability, B and D are more stable .
Comparing B and D
The extented conjugation is there in B as shown , so B is the most stable carbocation.
Structure in option A is stabilized only by hyperconjugation.
Structure in option C is vinylic carbocation, which is the least stable.
In option B and D , the carbocations are resonance stabilized as well as stabilized by hyperconjugation.
Since resonance is more predominant effect in determining stability, B and D are more stable .
Comparing B and D
The extented conjugation is there in B as shown , so B is the most stable carbocation.
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