Question

Why the tendency of ClO3 to form dimer is high?

Answer 1

 ClO2ClOX2 to form dimer is less and that of ClO3ClOX3 to form dimer is more.

I can understand the reason for the former because the unpaired electron is more delocalized in this case. So, if an electron is localized, i.e. it is at rest then the tendency of the molecule to form dimer will be high. Whereas if the electrons are delocalized, i.e. it is moving, then the tendency of the molecule to form dimer will be less.

Answer 2

So, if an electron is localized, i.e. it is at rest then thetendency of the molecule to form dimer will be high. Whereas if the electrons are delocalized, i.e. it is moving, then the tendency of the molecule to form dimer will be less.