Chemistry - Nomenclature Question with Solution | TestHub

$\mathrm{CHO}$ is the principal group (suffix carbaldehyde), so its ring carbon is ${\mathrm{C}}_1$. The lowest locants put $\mathrm{OH}$ on ${\mathrm{C}}_2$ and $\mathrm{Br}$ on ${\mathrm{C}}_4$.

Name: 4-bromo-2-hydroxybenzenecarbaldehyde.