Which specific substituent group, when present at the ortho or para position, greatly activates an a — Haloalkanes and Haloarenes Chemistry Question

💡 Solution & Explanation

Strong electron-withdrawing groups (EWG) such as the nitro group ($-NO_2$) at the ortho and para positions strongly activate haloarenes towards nucleophilic substitution by withdrawing electron density and stabilizing the resulting anionic intermediate.