• # question_answer Which of the following would be least reactive towards bromine [NCERT 1981] A) Nitrobenzene B) Phenol C) Anisole D) Chlorobenzene

Nitrobenzene is least reactive towards bromine because of presence of $-N{{O}_{2}}$ group decreases electron density at o and p positions and hence attack of electrophile on the benzene nucleus is difficult because + ve charge on o and p position repel the incoming electrophile.