O H.
One molecule in this class is the oxidation product of the Cannizzaro reaction, and a polymer of this type of molecule is found in disposable diapers because it can adsorb many times its weight in water. The simplest molecule in this class was first extracted from ants, and esters are often made by reacting one of these molecules with an alcohol.  An important tri- example of one of these acids is found in citrus fruits, while the odor of vinegar is due to the acetic type. Name this class of organic molecules containing a carbonyl (CAHR-buh-nil) bonded to a hydroxyl (hai-DROK-sil) group, often expressed as R C O O H.
One molecule in this class is the oxidation product of the Cannizzaro reaction, and a polymer of this type of molecule is found in disposable diapers because it can adsorb many times its weight in water.
{carboxylic acid} [or {carboxyl group;} prompt on acid]