CH3CH2CH=CH2\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{CH}=\mathrm{CH}_{2}CH3CH2CH=CH2
(CH3)2C=CHCH3\left(\mathrm{CH}_{3}\right)_{2} \mathrm{C}=\mathrm{CHCH}_{3}(CH3)2C=CHCH3
CH3CH=C(Cl)Br\mathrm{CH}_{3} \mathrm{CH}=\mathrm{C}(\mathrm{Cl}) \mathrm{Br}CH3CH=C(Cl)Br
CH3C(Cl)=CBr2\mathrm{CH}_{3} \mathrm{C}(\mathrm{Cl})=\mathrm{CBr}_{2}CH3C(Cl)=CBr2
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