CH2=CH2CH_2=CH_2CH2=CH2
CH≡CH\mathrm{CH} \equiv \mathrm{CH}CH≡CH
CH3CH2−O−CH2CH3\mathrm{CH}_{3} \mathrm{CH}_{2}-\mathrm{O}-\mathrm{CH}_{2} \mathrm{CH}_{3}CH3CH2−O−CH2CH3
CH3−O−CH3\mathrm{CH}_{3}-\mathrm{O}-\mathrm{CH}_{3}CH3−O−CH3
