2-etil-2-octena
CH3-C=CH-CH2-CH2-CH2-CH2-CH3
CH2
CH3
Fm = C10H20
Fb = (CH2)n
raportul masic C:H = 12x10 : 20x1 = 120 : 20 = 6:1
izomer de pozitie = 2-etil-3-octina
CH3-CH-CH=CH2-CH2-CH2-CH2-CH3
CH2
CH3
izomer de catena = 2-metil-2-nonena
CH3-C=CH2-CH2-CH2-CH2-CH2-CH2-CH3
CH3