(CH3)3C−>(CH3)2CH−>CH3CH2−\left(\mathrm{CH}_{3}\right)_{3} \mathrm{C}^{-}>\left(\mathrm{CH}_{3}\right)_{2} \mathrm{CH}^{-}>\mathrm{CH}_{3} \mathrm{CH}_{2}^{-}(CH3)3C−>(CH3)2CH−>CH3CH2−
CH3CH2−>(CH3)2CH−>(CH3)3C−\mathrm{CH}_{3} \mathrm{CH}_{2}^{-}>\left(\mathrm{CH}_{3}\right)_{2} \mathrm{CH}^{-}>\left(\mathrm{CH}_{3}\right)_{3} \mathrm{C}^{-}CH3CH2−>(CH3)2CH−>(CH3)3C−
(CH3)2CH−>(CH3)3C−>CH3CH2−\left(\mathrm{CH}_{3}\right)_{2} \mathrm{CH}^{-}>\left(\mathrm{CH}_{3}\right)_{3} \mathrm{C}^{-}>\mathrm{CH}_{3} \mathrm{CH}_{2}^{-}(CH3)2CH−>(CH3)3C−>CH3CH2−
(CH3)3C−>CH3CH2−>(CH3)2CH−\left(\mathrm{CH}_{3}\right)_{3} \mathrm{C}^{-}>\mathrm{CH}_{3} \mathrm{CH}_{2}^{-}>\left(\mathrm{CH}_{3}\right)_{2} \mathrm{CH}^{-}(CH3)3C−>CH3CH2−>(CH3)2CH−