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(D) In all the given reactions,the dehydration of alcohol in the presence of $H^+/\Delta$ proceeds via the formation of a carbocation intermediate.$A$

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All of these

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(D) In all the given reactions,the dehydration of alcohol in the presence of $H^+/\Delta$ proceeds via the formation of a carbocation intermediate.$A$: The carbocation formed after the loss of $H_2O$ is resonance-stabilized by the adjacent double bond.$B$: The carbocation formed is an allylic carbocation,which is resonance-stabilized.$C$: The carbocation formed is benzylic,which is highly resonance-stabilized by the benzene ring.Since all reactions involve the formation of a resonance-stabilized carbocation intermediate,the correct answer is $(d)$.

In which of the following reactions will a resonance-stabilized product be formed?

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