Why is the charge localised here: Image
It has negative charge in conjugation π-bond. So, why resonance is not possible?
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If resonance was possible, once carbon would have 2 pi bonds and 2 sigma bonds, which means that particular carbon would be sp hybrid. It's orbitals would require 180 angle which is not possible for benzene ring to provide(only 120 is possible because it's a hexagon and all) And this negative charge with have a significant repulsion from the conjugated electrons. So this negative charge, it's existence itself is really unstable.