de pozitie:
CH2=CH-CH2-CH2-CH3, 1-pentena
CH3-CH=CH-CH2-CH3, 2-pentena
de catena:
CH2=C-CH2-CH3 , 2-metil-1-butena
CH3
CH2=CH-CH-CH3 , 3-metil-1-butena
CH3
CH3-C=CH-CH3 , 2-metil-2-butena
CH3
geometrici: l
CH3- -H l CH3- -H
C=C l C=C
H- -CH2-CH3 l H- -CH2-CH3
cis-2-pentena l trans-2-pentena