⊕CH3
(CH3)2⊕CH\left(\mathrm{CH}_{3}\right)_{2}{ }^{\oplus} \mathrm{CH}(CH3)2⊕CH
H2C⊕CH3\mathrm{H}_{2} \mathrm{C}^{\oplus} \mathrm{CH}_{3}H2C⊕CH3
(CH3)3C⊕\left(\mathrm{CH}_{3}\right)_{3} \mathrm{C}^{\oplus}(CH3)3C⊕
