Final answer:
Isomers are molecules with the same molecular formula but arranged differently, including structural isomers, geometric isomers, and enantiomers, which have different structures, spatial arrangements around double bonds, and mirror image configurations, respectively.
Step-by-step explanation:
Isomers in Chemistry
Isomers are molecules with the same molecular formula but different arrangements of atoms. There are several types of isomers, including structural isomers, geometric isomers, and enantiomers.
Structural isomers have different covalent arrangements of atoms. For example, the structural isomers of butane (C4H10) cannot be converted to one another without breaking covalent bonds.
Geometric isomers have the same order of atom bonding but differ in the spatial arrangement of atoms around a double bond, such as the cis-trans isomers of butene (C4H8).
Enantiomers are stereoisomers that are mirror images of each other and cannot be superimposed. They are often found around chiral carbons, where the carbon is bonded to four different atoms or groups. An example of enantiomers is the D-form and L-form of the amino acid alanine, which are used differently in biological systems.
In reference to the given choice of molecules, we need more context to definitively classify them. However, based on the descriptions provided, we can infer that the statement 'These molecules are' could potentially be completed with one of the types of isomers mentioned, depending on the specific molecular arrangements being discussed.