Carboxylic acids contain a carboxyl group (C=O) attached to a hydroxyl group (-OH). They are commonly named with the suffix -ic acid in their trivial names or -oic acid in IUPAC nomenclature. Carboxylic acids are polar due to hydrogen bonding between the hydroxyl and carbonyl groups. They are stronger acids than alcohols due to delocalization of charge in the carboxyl group and the electronegative oxygen withdrawing electron density from the hydroxyl hydrogen. Electron withdrawing substituents increase acidity while electron donating substituents decrease it.