ORGANIC CHEMISTRY Chapter 7 Cis-Trans Isomerism in alkenes CH3 CH CH 3 Sc=c cis-2-Butene tranS-2-Butene The E Z Designation H CI Br H Br H (E)-1-Bromo-2-chloro-Butene (2r-1-Bromo-2-chloro-Butene Department of Chemistry, Xiamen UniversityORGANIC CHEMISTRY Department of Chemistry, Xiamen University Chapter 7 Cis-Trans Isomerism in Alkenes Cis-Trans Isomerism in Alkenes C C CH3 H CH3 H C C H CH3 CH3 H cis-2-Butene trans-2-Butene The E, Z Designation The E, Z Designation C C H Br Cl H C C Br H Cl H (E)−1−Βromo-2-chloro−Butene (Z)−1−Βromo-2-chloro−Butene