Which of the following functional groups is commonly associated with antioxidant properties in vitamins?

• A. $\text{Amino group}$
• B. $\text{Carboxyl group}$
• C. $\text{Carbonyl group}$
• D. $\text{Hydroxyl group}$

Answer: (D)

Verified step by step guidance

1. Understand the role of antioxidants: Antioxidants are molecules that can donate an electron to neutralize free radicals, preventing cell damage.
2. Identify the functional groups: The problem lists amino, carboxyl, and carbonyl groups, and mentions the hydroxyl group as the correct answer.
3. Consider the chemical properties: Hydroxyl groups (\( -OH \)) are known for their ability to donate hydrogen atoms, which is a key feature in antioxidant activity.
4. Compare with other groups: Amino groups (\( -NH_2 \)), carboxyl groups (\( -COOH \)), and carbonyl groups (\( >C=O \)) do not typically exhibit the same level of antioxidant activity as hydroxyl groups.
5. Conclude the reasoning: The hydroxyl group is commonly associated with antioxidant properties due to its ability to donate hydrogen atoms, which helps neutralize free radicals.