COH and CHO do not have distinct formulas. They both have the same molecular formula, which is CH2O. However, they have different structural formulas. COH represents an alcohol functional group, where the carbon atom is bonded to a hydroxyl group (-OH) and a hydrogen atom. On the other hand, CHO represents an aldehyde functional group, where the carbon atom is bonded to a hydrogen atom and a carbonyl group (C=O).