In aromatic electrophilic substitution reactions, the electron-donating groups increase the reactivity of the aromatic ring towards electrophiles. Among the options, phenol has the most reactive ring due to the electron-donating effect of the hydroxyl group (-OH).
Thus, the correct answer is (C).
Which of the following are aromatic?
Give plausible explanation for:
(a) Diazonium salts of aromatic amines are stable.
(b) Aniline does not undergo Friedel-Crafts reaction.
(c) Aniline on nitration gives substantial meta product.