1. C3H6O; CH3-CO-CH3; acetona/propanona; cetone; CnH2nO (nu este neaparat general valabila)
2. C3H6O2; CH3-COO-CH3; etanoat de metil/acetat de metil; ester; nu are formula generala
3. C4H6; CH2=CH-CH=CH2; 1,3-butadiena; diena; CnH2n-n
4. C4H10O; OH-CH2-CH2-CH2-CH3; 1-butanol; alcooli; CnH2n+2O
5. C2H4O2; CH3-COOH; acid acetic/acid etanoic; acizi, CnH2nO2
