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(B) The rate of dehydration of alcohols depends on the stability of the carbocation formed in the rate-determining step (r.d.s.).$1$. For $(i)$,the ca

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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 formed in the rate-determining step (r.d.s.).$1$. For $(i)$,the carbocation formed is allylic and benzylic,which is highly stabilized by resonance ($7$ resonating structures).$2$. For $(ii)$,the carbocation formed is benzylic,which is stabilized by resonance ($6$ resonating structures).$3$. For $(iii)$,the carbocation formed is vinylic,which is highly unstable.Therefore,the stability order of the carbocations is $(i) > (ii) > (iii)$.Consequently,the rate of dehydration follows the same order: $(i) > (ii) > (iii)$.

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

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