aldehyde

butyraldehyde; butanal

propionaldehyde; propanal CH3CH2CHO

acetaldehyde H3CCHO; ethanal

furfural (chemistry)

urea formaldehyde

formaldehyde (HCHO)

phenolic aldehyde; phenolic resin (used to manufacture bakelite)

acrolein CH2CHCHO

glyceraldehyde (CH2O)3

polyformaldehyde (CH2O)n

benzaldehyde C6H5CHO, the simplest aromatic aldehyde