# How do E and Z isomers arise in molecules?

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anor277 Share
Dec 13, 2016

Structural isomerism derives from different connectivity for a given formula.

#### Explanation:

Geometric isomerism presumes the SAME structural isomerism, i.e. the same connectivity, however different geometry for the same structure. Organic chemistry provides rich examples of structural and geometric isomerism, and $E , Z$ or $\text{cis/trans}$ isomerism provides many instances.

Consider $\text{2-butylene}$, ${H}_{3} C - C H = C H - C {H}_{3}$; this is a simple organic structure that can nevertheless generate 2 geometric isomers as shown.

For both isomers, connectivity IS THE SAME. $C 1$ connects to $C 2$ to $C 3$ to $C 4$. Nevertheless, because of the different geometry, the isomeric butenes have different structures, and chemical properties.

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