Answer:
A) the same molecular formula but different chemical properties.
Explanation:
Isomerism is the existence of a compound with the same molecular formula but different molecular structures due to the difference in the arrangement of atoms or spatial orientation of the atoms. In such a compound, they differ in physical and/or chemical properties. Such possible structures are known as isomers.
Propanol and isopropanol differs only in the arrangement of atoms but they both have the same molecular formula. Their physical and chemical properties differ.
