The connectivity of a molecule often has a strong influence on its physical and chemical properties and behavior. Two molecules composed of the same numbers of the same types of atoms (i.e. a pair of isomers) might have completely different chemical and/or physical properties if the atoms are connected differently or in different positions. In such cases, a structural formula is useful, as it illustrates which atoms are bonded to which other ones. From the connectivity, it is often possible to deduce the approximate shape of the molecule.
the connectivity of a molecule often has a strong influence on its physical and chemical properties and behavior two molecules composed of the same numbers of the same types of atoms (ie a pair of isomers) might have completely different chemical and/or physical properties if the atoms are connected differently or in different positions in such cases a structural formula is useful as it illustrates which atoms are bonded to which other ones from the connectivity it is often possible to deduce the approximate shape of the molecule