The alkene shown is hydrated with aqueous $\mathrm{H}{}_2\mathrm{SO}{}_4$. Which structure is the major product?

The alkene is 2,3-dimethylbut-1-ene. Protonation gives the tertiary 2,3-dimethylbut-2-yl cation; a hydride shift would only give an identical tertiary cation, so the skeleton is unchanged. Water capture gives 2,3-dimethylbutan-2-ol.