In the dehydration of an alcohol with concentrated sulphuric acid, which reaction step is the rate-limiting step?

Protonation of alcohol

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Elimination of water from protonated alcohol

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Elimination of proton

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Unimolecular elimination of hydroxide from alcohol

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Solution

The correct option is C Elimination of water from protonated alcohol
Elimination of water from protonated alcohol to form a carbocation is a slow and rate determining step.

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