CHCl3\mathrm{CHCl}_{3}CHCl3
CH3Cl\mathrm{CH}_{3} \mathrm{Cl}CH3Cl
CCl4 \mathrm{CCl}_{4} \text { }CCl4
CH2Cl2\mathrm{CH}_{2} \mathrm{Cl}_{2}CH2Cl2