What is a characteristic feature of Kekule (structural) formulas?

Kekulé formulas are specifically designed to represent the connectivity of atoms in a molecule, indicating how they are linked together through covalent bonds. In these formulas, single bonds are commonly depicted, and in some cases, double and triple bonds are also illustrated to reflect the actual bonding in the molecule. This representation is crucial for understanding the structure and behavior of organic compounds, particularly in terms of reactivity and stereochemistry.

The inclusion of bond types is vital in structural formulas since they provide insight into the electron sharing characteristics between atoms. For example, in a benzene ring, Kekulé's structures famously alternate between single and double bonds to convey resonance. Thus, the correct answer emphasizes the importance of showing connectivity with bonds, making it clear how each atom is integrated into the molecular framework.

While other options mention aspects like molecular weights, subscripts, or bond types, they do not accurately capture the primary function of Kekulé formulas, which is to display the connectivity and the nature of bonds in organic molecules.