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