Chemistry - STEREO ISOMERISM Question with Solution | TestHub

Cis/Trans Nomenclature: Determined by looking at the relative positions of identical groups. Here, both cyclopropyl rings in compound (D) are on the same side, making it a cis isomer.

E/Z Nomenclature: Determined by assigning Cahn-Ingold-Prelog (CIP) priorities to the groups on each carbon of the double bond.

Priority Assignment: On the left carbon, the oxirane ring has higher priority than the cyclopropyl ring (

$$Oxirane>Cyclopropyl$$

$),whileontherightcarbon,thecyclopropylringhashigherprioritythanthemethylgroup($$Cyclopropyl > CH₃$$).

Conclusion: Since the highest priority groups (oxirane on the bottom left and cyclopropyl on the top right) are on opposite sides of the double bond, it has an E configuration, making (D) both cis and E.