Acid-catalysed dehydration of which of the following compounds is fastest?

t-Butanol

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sec-Butanol

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n-Butanol

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All dehydrate at similar rate

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Solution

The correct option is A t-Butanol
Compounds that form more stable carbocation undergo fastest acid catalysed dehydration. t-Butanol (option a) forming tertiary carbocation which has $9 - α$ hydrogens undergoes fastest acid-catalysed dehydration. Hence, the correct answer is option (a).

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