H2C=CH2\mathrm{H}_{2} \mathrm{C}=\mathrm{CH}_{2}H2C=CH2
CH3−CH3HSO4\mathrm{CH}_{3}-\mathrm{CH}_{3} \mathrm{HSO}_{4}CH3−CH3HSO4
CH3−CHO\mathrm{CH}_{3}-\mathrm{CHO}CH3−CHO
CH3−O−CH3\mathrm{CH}_{3}-\mathrm{O}-\mathrm{CH}_{3}CH3−O−CH3