Question

explanation ..........​

Answer 1

When an electron withdrawing group(Like NO2) is present on benzene ring, it withdraws electron from benzene ring due to resonance (Pi- LP conjugation),creating deficiency of electrons on ortho and para positions.Hence Nucleophile easily comes attacks the electron deficient site.

You can try it:Just draw a benzene ring with NO2 on top and draw resonating structures of it.You’ll get to know

that is why the answer is (4)