Chemistry - STEREO ISOMERISM Question with Solution | TestHub

CIP priorities : at the left carbon Cl $>$ CH₃; at the right carbon CHO $>$ C₂H₅. In the correct structure Cl and CHO lie on opposite sides of the double bond, so it is the E-isomer.

The first structure has Cl and Br (the higher groups) on the same side (Z). The third structure carries two identical CHCl₂ groups on one carbon and the fourth has a =CH₂ end, so neither can show E/Z isomerism.