What is a characteristic feature of carboxylic acids that distinguishes them from other organic compounds?

A characteristic feature of carboxylic acids that distinguishes them from other organic compounds is the presence of the carboxyl functional group (-COOH). This group consists of a carbonyl group (C=O) and a hydroxyl group (-OH) attached to the same carbon atom. Carboxylic acids are acidic due to the presence of the hydroxyl group, which can release a proton (H+) in solution, making them weak acids. This unique functional group imparts specific chemical and physical properties to carboxylic acids, such as acidity, solubility in water, and the ability to undergo various reactions, including esterification and saponification.