Flexi Says: The carboxyl group contains the C=O of the carbonyl group, with the carbon atom also being bonded to a hydroxyl −OH group. A carboxylic acid is an organic compound that contains the carboxyl functional group. The general formula for a carboxylic acid can be abbreviated as R–COOH, where R can be a hydrogen atom, alkyl, or aryl group, etc. The carbon atom of the carboxyl group may be attached to a hydrogen atom or a carbon chain.
