The correct answer is D. Carboxylic acid.
A carboxylic acid is an organic compound that contains a carboxyl group (-COOH). The carboxyl group is a functional group that consists of a carbon atom double-bonded to an oxygen atom and also bonded to a hydroxyl group (-OH). Carboxylic acids are typically sour-tasting and are found in many foods, such as vinegar and citrus fruits. They are also used in a variety of industrial applications, such as the production of plastics and pharmaceuticals.
Alcohols are organic compounds that contain a hydroxyl group (-OH) bonded to a carbon atom that is not part of a double bond. Alcohols are typically colorless, flammable liquids that are found in many beverages, such as beer, wine, and liquor. They are also used in a variety of industrial applications, such as the production of solvents and fuels.
Aldehydes are organic compounds that contain a carbonyl group (C=O) bonded to a hydrogen atom. Aldehydes are typically colorless, flammable liquids that have a strong, unpleasant odor. They are found in many foods, such as fruits and vegetables, and are also used in a variety of industrial applications, such as the production of plastics and pharmaceuticals.
Ketones are organic compounds that contain a carbonyl group (C=O) bonded to two carbon atoms. Ketones are typically colorless, flammable liquids that have a strong, unpleasant odor. They are found in many foods, such as fruits and vegetables, and are also used in a variety of industrial applications, such as the production of plastics and pharmaceuticals.