Final answer:
Isomers are compounds that have the same molecular formula but different atom-to-atom bonding and therefore different structures. They are represented by two different structures. In the case of acetic acid (C₂H₄O₂), there could be another compound with the same formula but a different structure.
Step-by-step explanation:
The two structures that represent the same compound are called isomers. Isomers are compounds that have the same molecular formula, but different atom-to-atom bonding and therefore different structures. For example, in the case of acetic acid (C₂H₄O₂), there could be another compound with the same formula but a different structure.