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Question

The octet rule is not obeyed by which of the following molecule:

A
CO2
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B
H2O
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C
O2
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D
CO
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Solution

The correct option is D CO
In the case of CO, carbon can share at most two electrons with the oxygen atom, thus totaling (4+2)=6 valence electrons in its outermost shell, while octet of oxygen atom is achieved in the process.But, the carbon is 2 e- deficient. Hence the octet rule is not obeyed by the CO here.

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