CH3Cl\mathrm{CH}_{3} \mathrm{Cl}CH3Cl
CH3Br\mathrm{CH}_{3} \mathrm{Br}CH3Br
CHCl3\mathrm{CHCl}_{3}CHCl3
H3C−CH2 F\mathrm{H}_{3} \mathrm{C}-\mathrm{CH}_{2} \mathrm{~F}H3C−CH2 F