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 $-CH(C{H}_3{)}_2$ . 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.