Question

NO2 dimerises to form N2O4. Why ?

Answer 1

 (NO2) contains odd number of valence electrons. It behaves as an odd electron molecule and therefore undergoes dimerisation to form stable Dinitrogen tetroxide (N2O4) molecule with even number of electrons.

Answer 2

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• ❤.. ${NO2}$ containd odd number of valence electrons.
• ❤.. It behaves as a typical odd molecule.
• ❤.. On dimerisation, it is converted to stable${N2O4}$ molecule with even number of electrons.