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How do geometric isomers occur?

Answer 1

See below.

Geometric isomerism comes from the fact that compounds containing double bonds show restriction of rotation about the double bond (C=C).

So in order for a compound to exhibit geometric isomerism it must have:
1. a double bond i.e. an alkene linkage.
2. two identical groups attached to the adjacent C atoms
3. two different groups attached to each C on the double bond.

Example: but-2-ene

looking at the isomers of but-2-ene, it has one identical group attached on each side of the double bond (H atoms) and also a methyl group ( a different group from the H atoms) attached on each side of the double bond.

Hope this wasn't too confusing :)

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Answer 2

Elias Aguila

Geometric isomers occur when there is restricted rotation around a double bond, resulting in different spatial arrangements of atoms or groups around the bond. This can happen when two different atoms or groups are attached to each of the carbon atoms in the double bond, leading to two distinct geometric configurations known as cis and trans isomers.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.