Ketone is an organic compound that contains a carbonyl group, which is a functional group consisting of a carbon atom double-bonded to an oxygen atom. The term 'ketone' is used to describe a variety of compounds, including IRONE (5 letters), CAMPHOR (7 letters), and ACETONE (7 letters). IRONE is a ketone with a five-carbon chain, CAMPHOR is a cyclic ketone with a seven-carbon ring, and ACETONE is a three-carbon ketone. All three of these compounds are commonly used in a variety of applications, such as solvents, fragrances, and pharmaceuticals.