Chemistry - Nomenclature Question with Solution | TestHub

The ketone is the principal group, so ${\mathrm{C}}_1$ is the $\mathrm{C}=\mathrm{O}$ carbon. The ring double bonds are at ${\mathrm{C}}_2$ and ${\mathrm{C}}_5$, and the $\mathrm{C}{\mathrm{H}}_3$ groups are on ${\mathrm{C}}_2$, ${\mathrm{C}}_4$, ${\mathrm{C}}_4$ and ${\mathrm{C}}_6$.

Name: 2,4,4,6-tetramethylcyclohexa-2,5-dien-1-one.