Identifying Functional Groups in Organic Compounds

In organic chemistry, functional groups are specific groups of atoms within molecules that are responsible for the characteristic chemical reactions of those molecules.

Consider the following compounds:

1. 1-Butanol
2. Phenol
3. Acetic Acid
4. Ethylene Glycol

Which of the following compounds contains both hydroxyl (-OH) and carboxyl (-COOH) functional groups?