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

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Oct 14, 2016

This can be written as $C {H}_{3} - C H = C \left(C {H}_{3}\right) - C {H}_{2} - C {H}_{3}$

#### Explanation:

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).
The E-isomer where they are on opposite sides (from Entgegen=opposite).

Note: They are also called cis- (Z) and trans- (E).

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