We know that the addition and elimination reactions are opposite of each other.Hence, for solving the above questions our approach should be to first dehydrate a suitable alcohol to give either a single alkene or a mixture of an alkene, if we obtain a mixture of alkene then we would have to detect which of the alkene will give us the desired alcohol. Wherever required the acid-catalyzed addition of water to alkenes will follow Markovnikov’s rule.

As addition is the reverse of elimination we first dehydrate our required product to obtain –

Now, if we add H₂O to either of the three alkenes in presence of an acid we get the desired alcohol.