CH3 C CH CH-CH3 Br CHaCH CH2CH2 CH2CH3 (Z)- (E) CI>h I> Br CH3CH2-> CH3 CH-CH3>CH2 CH2CH2 CH3 CH3 CH 顺 (E)C C H CH3 CH3 C2H5 C C H Cl I Br CH2CH2CH2CH3 C C CH3CH2 CH3 CH-CH3 CH3 （ Z ）- （E ）- Cl ＞H ； I ＞ Br CH3CH2 - ＞ CH3 - -CH-CH3 ＞CH2CH2CH2CH3 - CH3 （E ）- 顺-