Which of the following is an example of a functional group in organic chemistry?

• A. Nucleotide
• B. $\text{Hydroxyl group (}{\text{–O}}_{\text{H}}\text{)}$
• C. Polysaccharide
• D. Exoenzyme

Answer: (B)

Verified step by step guidance

1. Identify the definition of a functional group in organic chemistry: A functional group is a specific group of atoms within a molecule that is responsible for a characteristic chemical reaction of that molecule.
2. Review the options provided: Nucleotide, Hydroxyl group, Polysaccharide, and Exoenzyme.
3. Understand that a nucleotide is a building block of nucleic acids, not a functional group.
4. Recognize that a polysaccharide is a carbohydrate polymer, not a functional group.
5. Identify that a hydroxyl group (\(\text{-OH}\)) is a common functional group in organic chemistry, often found in alcohols, and is responsible for their chemical properties.