Which of the following compound(s) has ' $Z$ ' configuration?
Which of the following compound(s) has ' $Z$ ' configuration?
(i) only
(ii) only
(iii) only
(i) and (iii)
Solution
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 : $\mathrm{Br}>\mathrm{Cl}$ and $\mathrm{CH}_3>\mathrm{H}$ )
Hence, compound (i) and (iii) have $(Z)$ configuration.
