The acid-catalyzed addition of alcohols to alkenes takes place via a mechanism analogous to acid-catalyzed alkenes hydration. The reaction occurs in 3 steps
1) Addition of H+ to the alkene together with any possible carbonation rearrangements;
2) Addition of the alcohol to the carbonation
3) Deprotonation to yield the product ether.
Depict the product of step 2 when 1-butene reacts with methanol in the present of H2SO4 catalyst.