Compare the substances represented by these two diagrams. Left: 2 C atoms are double bonded together, to H above left and below right, and to upper C l below left and above right. Right: Two C atoms are double bonded together, above left and right to upper C l, and below left and right to H. Are these two molecules structural isomers, geometric isomers, or not isomers at all? They are not isomers. They are structural isomers. They are geometric isomers.