Chemistry - GOC Question with Solution | TestHub

$-{\mathrm{OCH}}_3,{\mathrm{NHCOCH}}_3$ and -OH are activating groups because the atom directly bonded to benzene ring activates the ring by +R effect using its lone pair of electrons. Activating groups are ortho- and para directing groups.
-CN and $-{\mathrm{SO}}_3\mathrm{H}$ are deactivating groups because the atom directly bonded to benzene is bonded to more electronegative atom through multiple bonds and they are meta directing groups due to -R effect. Halides are deactivating groups due to -I effect.