Alcohols contain the –OH functional group. Ethanol is made from sugars by fermentation, and concentrated using fractional distillation. Carboxylic acids contain the –COOH functional group.

In chemistry, an amino acid is a molecule that contains both amine and carboxyl functional groups. In biochemistry, this term refers to alpha-amino acids with the general formula H2NCHRCOOH, where ...

Esters are formed by the condensation reaction between an alcohol and a carboxylic acid. This is known as esterification. ... The functional group (-COO) is known as the ester link.