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Decreasing order of dehydration of the following alcohols is
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b > d > c > a
The dehydration of alcohol takes place via the formation of a carbocation. Hence, the rate of reaction depends on the stability of carbocation.
No dehydration is possible in phenol because carbocation formation is difficult in case of phenol.
Option (d) fast due to loss of and conjugation increasing stable of compound as compared to (c). Option(b) is very fast because stable compound formed.
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