The order of reactivity of the following alcohols towards dehydration is:

I V > I > I I > I I I

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I I I > I V > I I > I

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I I > I > I I I > I V

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I I > I I I > I > I V

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Solution

The correct option is C $I I > I > I I I > I V$
Reactivity of alcohol towards dehydration is increased by the stability of the carbocation formed subsequently. Order of carbocation stability is :
$t e r t i a r y > s e c o n d a r y > p r i m a r y .$
Also presence of $+ I$ groups like $C H_{3}$ increases the stability.
According to this the order of reactivity is ,
$I I > I > I I I > I V$

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