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(B) The rate of dehydration of alcohols is directly proportional to the stability of the carbocation formed as an intermediate.$(a)$ Phenol: The carbo

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$b > d > c > a$

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(B) The rate of dehydration of alcohols is directly proportional to the stability of the carbocation formed as an intermediate.$(a)$ Phenol: The carbocation formed would be highly unstable due to the $sp^2$ hybridized carbon atom.$(b)$ Cyclohexa$-2,4-$dien$-1-$ol: Forms a resonance-stabilized carbocation (aromatic character can be achieved).$(c)$ Cyclohex$-2-$en$-1-$ol: Forms a resonance-stabilized allylic carbocation.$(d)$ Cyclohexanol: Forms a secondary carbocation.Comparing the stability: $(b) > (c) > (d) > (a)$.Therefore,the decreasing order of dehydration is $b > c > d > a$.

The decreasing order of dehydration of the following alcohols is:

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