CH3CH2Cl\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{Cl}CH3CH2Cl
CH2=CH2\mathrm{CH}_{2}=\mathrm{CH}_{2}CH2=CH2
CH3CHO\mathrm{CH}_{3} \mathrm{CHO}CH3CHO