During dehydration of alcohols to alkenes by heating with conc. $\mathrm{H}_2 \mathrm{SO}_4$ the initiation…

During dehydration of alcohols to alkenes by heating with conc. $\mathrm{H}_2 \mathrm{SO}_4$ the initiation step is
  1. formation of carbocation
  2. elimination of water
  3. formation of an ester
  4. protonation of alcohol molecule

Asked in: JEE Main 2003

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