Acid-catalysed dehydration of which of 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
These compounds who formed more stable carbocation undergo acid-catalyzed dehydration fastly. Hence, $t - B u t a n o l$ from tertiary carbocation which has $9 - α$ hydrogen undergo fast acid - catalyzed dehydration.

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