Răspuns:
izomeri de pozitie
CH2=CH-CH2-CH2-CH3 1 pentena
CH3-CH=CH-CH2-CH3 2pentena
izomeri de catena
CH2=C(CH3)-CH2-CH3 2metil 1 butena
CH2=CH-CH(CH3)-CH3 3metil 1 butena
CH3-C(CH3)=CH-CH3 2metil 2 butena
izomeri geometrici
H H
I I cis 2pentena
CH3-C=C-H2-CH3
CH3 H
I I trans 2 pentena
H -C = C-CH2-CH3