Q. Which of the following would react most readily with nucleophiles?
ManipalManipal 2015Hydrocarbons
Solution:
Nucleophile always attacks on electron deficient site. Presence of electron withdrawing group such as $NO _{2}$, CHO etc., decreases the electron density on benzene nucleous, hence such group activates the ring towards nucleophilic attack. While presence of electron releasing groups such as $R$ or $O R$ increase the electron density, thus deactivate the nucleus toward nucleophilie attack. $NO _{2}$ group activate the ring more than Cl toward nucleophilic attack hence react readily with nucleophile.
