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Why does NO2 dimerise? - Chemistry

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Why does NO2 dimerise?

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Solution

NO2 dimerises because it contains an odd number of valence electrons and leads to the delocalisation of unpaired electrons. Upon dimerisation, it forms a more stable N2O4 molecule with an even number of electrons. Thus, it has a tendency to dimerise.

Concept: P - Block Group 15 Elements - Oxides of Nitrogen
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