Question

"For the 4 molecules drawn below determine the relationship between the molecules, such as are the molecules structural isomers, enantiomers, diastereomers, the same molecule or different molecules."

First how do I show my work in this setting?

Second, what if I have a molecule that looks like the diastereomer of an enantiomer of the other molecule? What do I call it?

Third if there are molecules that have the same molecular formula would those be "same molecules" Or is it that those molecules that have different structures are" different molecules" and the molecules that have different orientations are "same molecules"