Final answer:
This question pertains to identifying and drawing resonance structures, which are multiple valid Lewis structures that represent the distribution of electrons in a molecule. The actual molecule is a hybrid of these structures, indicating electron delocalization.
Step-by-step explanation:
The question requires an examination of the provided molecular structures to identify which ones exhibit multiple resonance structures. Resonance structures are different valid Lewis electron structures for a single molecule that depict possible arrangements of electrons.
Resonance is an important concept as it provides a more accurate description of the electron delocalization within a molecule, particularly in species with conjugated systems of electrons. The true structure of a molecule is considered to be a resonance hybrid, an average of all the resonance forms. This concept helps us understand the actual electronic distribution better than a single Lewis structure can.
To determine the formal charge on each atom, you assess the number of valence electrons an atom would have in its free state against the number of electrons it 'owns' in the given structure. Any difference between these two numbers gives you the atom's formal charge in that resonance structure.