Roberto examines two molecular models. He sees that the atoms are the same in each model and are attached in the same order in each model. However, he cannot make the models appear the same without breaking a double bond. What do the models represent?

The models have the same atoms connected in the same order, so they are not structural isomers. A double bond prevents free rotation, allowing groups to be arranged differently on either side of the bond. Since the models cannot be made to match without breaking that bond, they are geometric isomers with the same molecular formula.

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