Acetaldehyde (systematically: ethanal) is an organic chemical compound with the formula CH3CHO or MeCHO. It is a flammable liquid. Acetaldehyde occurs naturally in ripe fruit, coffee, and bread, and is produced by plants as part of their normal metabolism. It is popularly known as a chemical that causes hangovers. Structure Like other carbonyl compounds, acetaldehyde tautomerizes to give the enol, ethenol, with Keq = 6 x 10−5. Production In the chemical industry, acetaldehyde is used as a… (More on Acetaldehyde)