Which of the following ions is more stable?

Question:

Which of the following ions is more stable? Use resonance to explain your answer.

Solution:

The stability of carbocation is decided by inductive effect, hyperconjugation, resonance etc.

As structure A is having a carbocation, which is primary and allylic carbocation, whereas the carbocation in structure B has secondary and allylic carbocation.

Hence, structure B is more stable.

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