Question

Can you say, whether the compound numbered as $10$ is E or Z isomer?

• A. $E$ isomer
• B. $Z$ isomer
• C. Both
• D. None

Answer 1

The correct option is B $Z$ isomer

The compound in the attached image numbered as 10 is Z isomer. The higher priority groups ($Cl$ and $I$) attached doubly bonded $C$ atoms are on the same side of the double bond. Hence, the isomer is Z isomer.
Note: The priority order is determined by atomic number. The atom with higher atomic number will have higher priority.