Definition<ALDEHYDE> is an <ORGANIC MOLECULE> that is recognised by the carbonyl functional group (-CHO). Aldehydes have at least one hydrogen atom attached to the carbonyl group. The remaining group may be another hydrogen or alkyl/aryl group
Typical aldehyde is a flammable liquid; characteristic, pungent odor; miscible with water and alcohol. Many naturally occurring aldehydes have pleasant odors and flavours.