Question

How do we check octet rule in resonance structures?

Answer 1

Even though this structure "exists" on paper or computer screen, it is meaningless in the real world. In other words, this structure does not exist in the real world as drawn and has only come into existence as part of the human effort to describe the chemistry of this world using simple and straightforward symbolism. As you probably know, the true structure is a hybrid of all resonance structures, and the octet rule is satisfied for the central carbon. Therefore, I think this question has no actual answer. 


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Answer 2

If there is a formal charge present in a compound, then the octet rule must be obeyed by looking at the bonds and lone pairs surrounding the formal charge. For example, an oxygen may take 3 lone pairs if bonded to one carbon but will have a negative formal charge. By understanding the nature of Van Der Waals forces you should be able to determine if a particular atom in a compound should have a positive or negative charge.