Which of the following does not obey octet rule?

H_{2} O

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O_{2}

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N O

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C O_{2}

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Solution

The correct option is C $N O$
In $N O$ , nitrogen has 5 valence electrons and oxygen has 6 valence electrons. The nitrogen atom shares two electrons with the oxygen atom. Therefore, it is left with 3 valence electrons in its outermost shell. So, only the octet of oxygen atom is achieved. Hence, it does not obey the octet rule completely.

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