1-Methylcyclohexene is treated with $\mathrm{O}{}_3$ followed by $\mathrm{H}{}_2\mathrm{O}{}_2$. The organic product is

The ring double bond ($\mathrm{C}{}_1(\mathrm{CH}{}_3)=\mathrm{C}{}_2\mathrm{H}$) is cleaved. C1 (fully substituted) becomes a ketone $\mathrm{CH}{}_3-\mathrm{C}(=\mathrm{O}){}^{-}$; C2 bears H and becomes CHO, which the oxidative work-up converts into COOH. The chain is $\mathrm{CH}{}_3\mathrm{CO}-(\mathrm{CH}{}_2){}_4-\mathrm{COOH}$, 6-oxoheptanoic acid. The aldehyde (6-oxoheptanal) would be obtained with Zn/H2O.