Which of the following statements about the functional group present in ${\mathrm{CH}}_3\mathrm{COOH}$ (acetic acid) is correct?

Which of the following functional groups is present in tricyclobutylamine?

Which functional group is present in a molecule with the general structure $R-C=O-\mathrm{R\text{'}}$?

Which of the following functional groups is present in the compound ${\mathrm{CH}}_3-\mathrm{COOH}$?

Which of the following correctly ranks the substituents nitro (${\mathrm{NO}}_2$), methyl (${\mathrm{CH}}_3$), and methoxy (${\mathrm{OCH}}_3$) on a benzene ring in order of increasing electron-donating ability?

Given the following generic structure: $R-X-Y=Z$, choose the most likely identities for $X$, $Y$, and $Z$ that would result in a carbonyl functional group.

Which of the following functional groups is present in a compound with the molecular formula $C_{10}{H}_{12}{O}_2$ that is commonly known as vanillin?