Q. Select the correct Lewis structures out of the following

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Solution:

Octet for carbon in the first two structures (A and B) is not complete and it does not have 4 valence electrons. Hence, they are incorrect. The last structure (D) for NO is also incorrect since nitrogen should have 5 valence electrons which are not shown.
The structure (C) for ClO is correct with Cl and O each having 7 & 6 valence electrons and extra gained electron on respectively and their octet being complete.