Which of the following is not a requirement for resonance?
The relative position of all the atoms in each of the canonical forms must be the same.
The number of unpaired and paired electrons in each of the canonical forms must be the same.
The contributing structures should not differ much in energy.
Like charges should not reside on atoms close together in canonical forms.
The number of unpaired and paired electrons in each of the canonical forms does not have to be the same for resonance to occur.