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in ClO2 ,the central Cl atom is sp2 hybridized with O-Cl-O angle of 118 degree.....the bond lengths are both 149 pm .....Cl-O bond has appreciable double bond character due to p(pi)-d(pi) bonding..the molecule is paramagnetic since it has one electron in a p-orbital...

now often odd electron molecules dimerizes in order to pair the electron but ClO2 does not ...this is probably due to the reason that odd electron is delocalized as it is involved in p(pi)-d(pi) bonding..

in contrast the odd electron on N in NO2 is localized as nitrogen does not contain a d orbital...

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12y ago
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Q: Why ClO2 do not form dimer but NO2 can?
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