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During dehydration of alcohols to alkenes by heating with conc. H2SO4, the initiation step is: 

(1) Elimination of water 

(2) formation of an ester 

(3) Formation of carbocation 

(4) protonation of alcohol molecule 

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During dehydration of alcohols to alkenes by heating with conc. H2SO4, the initiation step is protonation of alcohol molecule 

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