Why Nitrogen dioxide (NO2) dimerises to form Dinitrogen tetraoxide (N2O4)?

Nitrogen dioxide (NO₂) contains odd number of valence electrons. It behaves as a typical odd molecule. On dimerisation, it is converted to stable Dinitrogen tetra oxide (N₂O₄) molecule with even number of electrons.

Related Questions:

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Why Nitrogen dioxide (NO2) dimerises to form Dinitrogen tetraoxide (N2O4)?

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