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(B) The rate of dehydration of alcohols depends on the stability of the carbocation intermediate formed after the loss of water. $(i)$ forms a carboca

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$(i) > (ii) > (iii)$

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(B) The rate of dehydration of alcohols depends on the stability of the carbocation intermediate formed after the loss of water. $(i)$ forms a carbocation that is resonance-stabilized by the adjacent double bond and the benzene ring. $(ii)$ forms a secondary benzylic carbocation,which is stabilized by the benzene ring. $(iii)$ forms a vinylic carbocation,which is highly unstable. Comparing the stability: $(i)$ (allylic and benzylic resonance) > $(ii)$ (benzylic) > $(iii)$ (vinylic). Therefore,the rate of dehydration follows the order $(i) > (ii) > (iii)$.

Compare the rate of dehydration of $(i)$,$(ii)$ and $(iii)$ by conc. $H_2SO_4$.

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