Which carbocation is the most stable?

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(A) The stability of a carbocation $(C^{\oplus})$ is directly proportional to the extent of conjugation with adjacent $\pi$-bonds.In option $A$,the po

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(A) The stability of a carbocation $(C^{\oplus})$ is directly proportional to the extent of conjugation with adjacent $\pi$-bonds.In option $A$,the positive charge is conjugated with two $\pi$-bonds (a dienyl system),which provides maximum resonance stabilization.In option $B$,the positive charge is on a carbon atom that is part of a double bond (vinylic carbocation),which is highly unstable.In option $C$,the positive charge is conjugated with only one $\pi$-bond.In option $D$,the positive charge is not conjugated with any $\pi$-bond.Therefore,the carbocation in option $A$ is the most stable.

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