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Why can geometric isomers occur?

Answer 1

Because of restricted rotation about a double bond.

A compound with only one bond can never have geometric isomers (ignoring steric effects, i.e., group size) because you can never rotate an isomer back to its original configuration. A compound with two bonds can never rotate about the axis, so there are two possible arrangements for the four groups surrounding the C=C center, as long as there are multiple distinct groups.

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Answer 2

Jacob Anderson

Geometric isomers can occur due to restricted rotation around a double bond or a ring, leading to different spatial arrangements of substituent groups.

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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.