Generally, simple alcohol (-OH) is better protonation site than simple alkene.
However, alkene become better protonation site if it has greater electron density due to +R effect of oxygen or nitrogen.
Conc. H2SO4 cause dehydration.
Dil. H2SO4 cause hydration.
Hydration of alkyne converts it into vinylic cation which is attacked by water to give enol and it further tautomerise into ketone.
Hydration of ethers -When positive charge is on oxygen, One alkyl group is lost and attacked by H2O in SN1 orSN2 fashion to give mixture of ROH.
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