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During dehydration of alcohols to alkenes by heating with concentrated H2SO4 the initiation step is

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During dehydration of alcohols to alkenes by heating with concentrated H2SO4 the initiation step is
(a) protonation of alcohol molecule
(b) formation of carbocation
(c) elimination of water
(d) formation of an ester.

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(a) : Dehydration of alcohol to alkene in presence of concentrated H2SO4 involves following steps :

Thus, the initiation step is protonation of alcohol.

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