Describe and explain geometrical isomerism in non-cyclic alkenes. Single covalent bonds have free rotation around the bond, but double bonds are "locked" in place (at least in IB chemistry) -- restricted rotation. A cis- prefix implies that the relevant branches are arranged in a U shape, a trans- prefix means that these branches are opposite from each other.

Cis = same side
Trans = across (eg transvestite, transcrainial, transport)

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Topic: Organic Chemistry