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Q. During dehydration of alcohols to alkenes by heating with concentrated $H _{2} SO _{4}$ the initiation step is :

AIEEEAIEEE 2003Alcohols Phenols and Ethers

Solution:

Protonation of $- OH$ is first step. Conversion of poor leaving group (-OH) into good leaving group $(-\overset{+}{O}H_{2})$