Question

Which of the following compounds would be most reactive to ring bromination? СЕЗ CF CI NHz CH3 NOz

A) I    B) II    C) III    D) IV    E) V

Answer 1

CH3 and NH2 are activating groups which activate the ring towards electrophilic aromatic substitution. But NH2 is strongly activating than CH3 group which means NH2 group strongly increases the reactivity of benzene ring towards electrophilic aromatic substitution.

CF3, Cl and NO2 are deactivating groups which deactivate the aromatic ring towards electrophilic aromatic substitution which means they decrease the reactivity of benzene ring to undergo electrophilic aromatic substitution.

Therefore, answer is option is E) V