CH3CH=CH2\mathrm{CH}_{3} \mathrm{CH}=\mathrm{CH}_{2}CH3CH=CH2
CH3CH=CHCH3\mathrm{CH}_{3} \mathrm{CH}=\mathrm{CHCH}_{3}CH3CH=CHCH3
(CH3)2C=CHCH3\left(\mathrm{CH}_{3}\right)_{2} \mathrm{C}=\mathrm{CHCH}_{3}(CH3)2C=CHCH3
(CH3)2C=CH2\left(\mathrm{CH}_{3}\right)_{2} \mathrm{C}=\mathrm{CH}_{2}(CH3)2C=CH2