Identifying the Hydroxyl Functional Group

In organic chemistry, functional groups are specific groups of atoms within molecules that are responsible for the characteristic chemical reactions of those molecules. The presence of a functional group often influences the properties and reactivity of the compound. One common functional group is the hydroxyl group, which contains an oxygen atom bonded to a hydrogen atom (-OH). Another functional group is the carboxyl group, which contains a carbon atom double-bonded to an oxygen atom and single-bonded to a hydroxyl group (-COOH). Understanding the different functional groups is crucial for predicting chemical behavior.

Based on this information, which of the following compounds contains a hydroxyl functional group?