 Functional group is an alkene, therefore suffix = ene
 There are two alkenes, so insert the multiplier di
 The longest continuous chain is C4 therefore root plus "a" = buta
 The C=C units are both at the ends so we can number from either
end
 Locants for C=C units are therefore 1 and 3
buta1,3diene
or
1,3butadiene

CH_{2}=CHCH=CH_{2} 
 Functional group is an alkene, therefore suffix = ene
 There are two alkenes, so insert the multiplier di
 The longest continuous chain is C5 therefore root plus "a" = penta
 The first point of difference requires that we number from the right
as drawn
 Locants for C=C units are therefore 1 and 3
 The C3=C4 alkene has E stereochemistry
(E)penta1,3diene
or
(E)1,3pentadiene

CH_{3}CH=CHCH=CH_{2}

 Functional group is an alkene, therefore suffix = ene
 There are two alkenes, so insert the multiplier di
 The longest continuous chain is C5 therefore root plus "a" = penta
 The substituent is a C1 alkyl group i.e. a methyl group
 The first point of difference doesn't distinguish the C=C
 So, need to apply the first point of difference to the alkyl substituent.
 The first point of difference requires that we number from the left
as drawn
 The methyl group locant is 2
 Therefore the locants for C=C units are 1 and 4
2methylpenta1,4diene
or
2methyl1,4pentadiene

CH_{3}C(CH_{3})=CHCH=CH_{2}

 Functional group is an alkene, therefore suffix = ene
 There are two alkenes, so insert the multiplier di
 The longest continuous chain is C7 therefore root plus "a" = hepta
 The first point of difference requires that we number from the left as drawn
 Therefore the locants for C=C units are 2 and 4
 The C2=C3 alkene has E stereochemistry
 The C4=C5 alkene has Z stereochemistry
(2E,4Z)hepta2,4diene
or
trans,cishepta2,4diene

