Octet rule is not valid for which of the following molecule?

C O_{2}

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H_{2} O

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O_{2}

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C O

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Solution

The correct option is D $H_{2} O$
In $H_{2} O$ . the octet of oxygen atom got completed by sharing an electron with hydrogen, but hydrogen has only two electrons in its outermost orbit.
Thus, the octet of hydrogen is not complete. Thus Octet rule is not valid for it.

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