Question

Which of the following compound(s) has/have '$Z$' configuration?

• A. (i) only
• B. (ii) only
• C. (iii) only
• D. (i) and (iii)

Answer 1

The correct option is D (i) and (iii)

When the groups with higher priority (ie, with high atomic number) are present on same side of double bond, then the configuration is Z but when present on opposite side of double bond, the configuration is E.
(Priority: $Br>CI$ and $C{H}_3>H$)
Hence, compound (i) and (iii) have (Z) configuration.