The concept of resonance illustrates molecular structure which possess delocalized bonding.
• The resonating structures are required when a single structure is not adequate to illustrate all the characteristics of a molecule.
• The number of resonating structures relies on the existence of delocalized bonds or delocalized electrons.
• For example, benzene exhibits two resonance structures as it possess delocalized bonds while cyclohex-1-ene exhibits no resonance structure as it does not possess delocalized bond.
Thus, the resonance concept illustrates molecular composition, which possess delocalized bonds.
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