Question

Select the Z-isomer from the following alkenes

• A.
• B.
• C.
• D.

Answer 1

Answer: (C)

The groups of highest priority are $-Br$ and $-CH{\left(C{H}_3\right)}_2$. These are on same side in compound $C$. Hence, configuration $C$ is $Z$ -isomer. The configuration A does not show geometrical isomerism. In configuration $B$ and $D$, groups of highest priority are on the opposite sides and therefore, they are E-isomers.