CH3−X\mathrm{CH}_{3}-\mathrm{X}CH3−X
(CH3)2CHX\left(\mathrm{CH}_{3}\right)_{2} \mathrm{CHX}(CH3)2CHX
(CH3)3CX\left(\mathrm{CH}_{3}\right)_{3} \mathrm{CX}(CH3)3CX
CH3−CH2−X\mathrm{CH}_{3}-\mathrm{CH}_{2}-\mathrm{X}CH3−CH2−X
