by seeing these resonating structures we can see that a positive is there at ortho and para (marked o and p ) in structures. So we can conclude a nucleophile coming would attack at o and p .Whereas a electrophile coming would attack meta position .Also given in NCERT electron withdrawing groups are meta directing for a electrophilic aromatic substitution reaction .Hence which can be proved by this explanation and with the help of these resonating structures
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