The alkene shown is treated with ozone and then with $\mathrm{H}{}_2\mathrm{O}{}_2$ (oxidative work-up). Which pair of organic products is formed?

The compound shown is 2-methylbut-2-ene. Cleavage gives a ketone from the fully substituted carbon (propanone) and an aldehyde from the $\mathrm{CH}$ carbon (ethanal). Hydrogen peroxide oxidises the aldehyde to ethanoic acid, while the ketone is unaffected. So the pair is propanone and ethanoic acid.