Chemistry - STEREO ISOMERISM Question with Solution | TestHub

The E/Z configuration is determined by Cahn-Ingold-Prelog (CIP) rules for priorities at each double bond.

Concepts:

1. Cahn-Ingold-Prelog (CIP) Rules: Assign priorities to substituents on each carbon of the double bond.

2. E/Z Nomenclature:

* Z (zusammen): Higher priority groups are on the SAME side of the double bond.

* E (entgegen): Higher priority groups are on the OPPOSITE side of the double bond.

Solution:

For the first double bond, the higher priority groups are on opposite sides (E). For the second, they are on the same side (Z). Thus, $2\mathrm{E},4\mathrm{Z}$.