8.2A The(E)-(Z)System for designation alkene diastereomers Higher priority Br Higher priority H Higher priority (Z)-2-Bromo-1-chloro-1-floroethene (E)-2-Bromo-l-chloro-l-floroethene Higher priority H3C CH3 Higher priority、HaC CH3 >H CH3 Higher priority Z-2-Butene E)-2-Butene (cis)-2-Butene (trans)-2-Butene8.2A The ( E )-( Z ) System for designation alkene diastereomers Br H Cl F (Z)-2-Bromo-1-chloro-1-floroethene H Higher priority igher priority Br H F Cl (E)-2-Bromo-1-chloro-1-floroethene Higher priority H3C H CH3 H (Z)-2-Butene (cis)-2-Butene Higher priority Higher priority H3C H H CH3 (E)-2-Butene (trans)-2-Butene Higher priority CH3 H