Final answer:
The relationship between the given pairs of compounds depends on their molecular structures. Structural isomers have the same molecular formula with a different arrangement of atoms. Cis-trans isomers require the presence of a double bond, whereas enantiomers require a chiral center connected to four different groups.
Step-by-step explanation:
The relationship for the given pair of compounds can be determined by examining their structures and arrangement of atoms. Structural isomers have the same molecular formula but different connectivity or arrangement of atoms. Cis-trans isomers, also known as geometric isomers, have different spatial arrangements around a double bond, with cis meaning the same side and trans meaning opposite sides.
Based on the information provided, if we consider two molecules with the formulas CH3CH₂COOH and C3H6O₂, they could indeed be structural isomers because they share the same molecular formula but could potentially have different connectivities. Additionally, for molecules to be cis-trans isomers, they must possess a double bond, allowing for different spatial configurations. Moreover, enantiomers are a type of stereoisomer where molecules are non-superimposable mirror images of each other, which requires a carbon atom to be attached to four different atoms or groups, not just three.