c
Benzene having any activating group i.e, oH, Retc, undergoes electrophilic substitution very easily as compared to benzene itself. Thus toluene \(\left(\mathrm{C}_{6} \mathrm{H}_{5} \mathrm{CH}_{3}\right),\) phenol \(\left(\mathrm{C}_{6} \mathrm{H}_{5} \mathrm{O} \mathrm{H}\right)\) undergo electrophilic substitution very readily than benzene chlorine with \(+\mathrm{E}\) and \(+\mathrm{M}\) effect deactivating the ring due to strong \(-I\) effect. So, it is difficult to carry out the substitution in chlorobenzene than in benzene, so correct order is

Phenol \(>\) Toluene \(>\) Benzene \(>\) Chlorobenzene