Question

Which of the following represents (E)-3,6-dichloro-6-methyl-3-heptene?

Answer 1

EZ nomenclature is an extension of cis–trans isomer notation (which only describes relative stereochemistry) that can be used to describe double bonds having two, three or four substituents. Following the Cahn–Ingold–Prelog priority rules (CIP rules), each substituent on a double bond is assigned a priority.

E represents, the priority functional groups present on opposite sites of the double bond.