例:比较以下基团的优先顺序 1—cH=cH2与一cH2CH2CH3 CH=CH2 [>-CH-CH2> CHCH2CH3 2 与 - C-CH3 CH3 CHa C-CH3 CH例: 比较以下基团的优先顺序 1 2 CH CH2 CH CH2 C C CH CH2 与 CH2CH2CH3 CHCH2CH3 H > 与 C CH3 CH3 CH3 C C C CH3 CH3 > CH3