# What are the E and Z isomers of 3-methyl-2-pentene?

Oct 14, 2016

This can be written as $C {H}_{3} - C H = C \left(C {H}_{3}\right) - C {H}_{2} - C {H}_{3}$
Now there are two possible isomers, because the $=$ is inflexible:
The Z-isomer where the stuff left of the $=$ is at the same side of the $C = C$ as the stuff on the right, so both down or both up (from German Zusammen=together).