Explain why resonance structures are used instead of Lewis structure to correctly model certain molecules

See explanation

Explanation:

The bonding in certain compounds or ions can not be thoroughly explained in terms of a single Lewis structure.

The observed properties of the compound or ion indicate that it can not be entirely represented by a single Lewis structure. For example, all C-C bond  in benzene are equal.

When this is the case, a number of structures called resonance structures are invoked in order to satisfactorily explain the properties of the particular chemical specie under study.

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