Question

Some alkenes have cis-trans isomers because
A) the carbon atoms in the double bond cannot rotate.
B) each of the carbon atoms in the double bond has four different groups attached to it.
C) one of the carbon atoms in the double bond has two identical groups attached to it.
D) the carbon atoms in the double bond are free to rotate.
E) all of the carbon atoms in the compound are rigid and cannot rotate.

Answer

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