A. Presence of a hydroxyl group
B. Presence of a carbonyl group
C. Presence of a carboxyl group
D. Presence of an alkyl group
Answer: Presence of a carboxyl group
What is the main feature that distinguishes carboxylic acids from alcohols?
Additional Information: Carboxylic acids contain a carboxyl group (-COOH), while alcohols contain a hydroxyl group (-OH).