why does Nitrogen dioxide (NO2) dimerise ?

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Answer:-
NO2 contains odd number of valence electrons (5+6×2=17) it behaves as a typical odd molecule.On dimerisation it is converted to N2O4 which have even no. of electrons(5×2+6×4=34) which is stable.
I.e
why does Nitrogen dioxide (NO2) dimerise ?



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