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According to the solutions manual chapter three question 45, the boxed lewis structure in the attached image is not a resonance structure. Why not? it has 24 electrons and octets for all the atoms involved.
Check your formal charges.. the bottom structure has Cl with a FC of +1. But we know that Cl is an electronegative atom (or it has a high ionization energy), so it will not give up its electrons to become positive. As a rule the halogens (group 17) will only make 1 bond!
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