E/Z nomenclature

E = entgegan ("trans") Z = zusamen ("cis")

Priority of groups is based on the atomic mass of attached atoms (not the size of the group). An atom attached by a multiple bond is counted once for each bond.

fluorine atom > isopropyl group > n-hexyl group

deuterium atom > hydrogen atom

-CH₂-CH=CH₂ > -CH₂CH₂CH₃

Structure 1: (trans) 2-pentene or (E) 2-pentene

Structure 2: cis and trans convention cannot be used there are more than two non hydrogen attachments to the alkene

(E) 3-isopropyl-2-hexene or (E) 3-(1-methylethyl)-2-hexene