Functional Groups It should be noted that the importance of a functional group cannot be overstated. A functional group affects or determines all of the following properties of a molecule: ●Bonding and shape ● Chemical reactivity Type and strength of intermolecular forces Physical properties NomenclatureFunctional Groups It should be noted that the importance of a functional group cannot be overstated. A functional group affects or determines all of the following properties of a molecule:  Bonding and shape  Chemical reactivity  Type and strength of intermolecular forces  Physical properties  Nomenclature