An aldehyde or alkanal is an organic compoond conteenin a functional group wi the structur −CHO, conseestin o a carbonyl centre (a carbon dooble-bondit tae oxygen) wi the carbon atom an aa bondit tae hydrogen an tae an R group, which is ony generic alkyl or side cheen. The group—withoot R—is the aldehyde group, an aa kent as the formyl group. Aldehydes are common in organic chemistry. Mony fragrances are aldehydes.
- IUPAC Gold Book, aldehydes.