Step 1: Understanding the Concept:
A functional group is an atom or group of atoms within a molecule that determines the chemical properties of that molecule.
Most common functional groups in organic chemistry contain carbon (e.g., aldehyde \(-\text{CHO}\), carboxyl \(-\text{COOH}\)).
Step 2: Detailed Explanation:
The question asks for a functional group that does not contain a carbon atom itself.
The Hydroxyl group (\(-\text{OH}\)), present in alcohols, consists only of oxygen and hydrogen.
The Amino group (\(-\text{NH}_2\)), present in amines, consists only of nitrogen and hydrogen.
Either is a correct answer.
Step 3: Final Answer:
The Hydroxyl group (\(-\text{OH}\)) is a carbon-less functional group.