The order of reactivity of the following alcohols towards dehydration is$:$
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Reactivity of alcohol towards dehydration is increased by the stability of the carbocation formed subsequently. Order of carbocation stability is$:$ tertiary $>$ secondary $>$ primary.
Also presence of $+I$ groups like $CH_3$ increases the stability.
According to this the order of reactivity is, $II>I>III>IV$
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