CH CHaCH CH.CHOCH CH..CHCH HOCH Ethanal Propanal 2-Ethyl-4-methylpentanal (Acetaldehyde) (Propionaldehyde) CH,,CCH,CH,CHs CH, CH= CCHs 6354321 CH3CH2CCHCCH3 345 Hexanone 4-Hexen-2-one 2.4-Hexanedione ②2004 Thomso