Assertion: $N O_{2}$ and $C O_{2}$ both odd electron molecules and hence dimerizes.
Reason :- On dimerisation, $N O_{2}$ is converted to stable $N_{2} O_{4}$ molecule with even number of electrons.

Both Assertion and Reason are correct and the Reason is the correct explanation of the Assertion

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Both Assertion and Reason are correct but the Reason is not the correct explanation of the Assertion

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The Assertion is correct but the Reason is incorrect

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The Assertion is incorrect and the Reason is correct

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Solution

The correct option is D The Assertion is incorrect and the Reason is correct
$N O_{2}$ contain odd number of valence electrons.It dimerize to form $N_{2} O_{4}$ . $C O_{2}$ has even number of electrons in it and also it doesn't dimerize.
$N O_{2}$ contain odd number of valence electrons. It behaves as a typical odd molecule.On dimerisation, it is converted to stable $N_{2} O_{4}$ molecule with even number of electrons.
Hence option D is correct answer.

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Assertion: NO2 and CO2 both odd electron molecules and hence dimerizes.Reason :- On dimerisation, NO2 is converted to stable N2O4 molecule with even number of electrons.

Assertion: $N O_{2}$ and $C O_{2}$ both odd electron molecules and hence dimerizes.
Reason :- On dimerisation, $N O_{2}$ is converted to stable $N_{2} O_{4}$ molecule with even number of electrons.