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(D) Reactivity towards an electrophilic aromatic substitution reaction depends on the electron density of the benzene ring. Electron-donating groups $

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$(iv) > (ii) > (i) > (iii)$

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(D) Reactivity towards an electrophilic aromatic substitution reaction depends on the electron density of the benzene ring. Electron-donating groups $(EDG)$ increase the electron density,making the ring more reactive,while electron-withdrawing groups $(EWG)$ decrease it. The substituents are: $(iv) 	ext{ Phenol } (-OH): 	ext{ Strong EDG due to } +M 	ext{ effect.}$ $(ii) 	ext{ Toluene } (-CH_3): 	ext{ Weak EDG due to } +I 	ext{ and hyperconjugation.}$ $(i) 	ext{ Benzene: Reference compound.}$ $(iii) 	ext{ Chlorobenzene } (-Cl): 	ext{ EWG due to strong } -I 	ext{ effect (despite } +M 	ext{ effect, the net effect is deactivating).}$ Therefore,the order of decreasing reactivity is: $(iv) > (ii) > (i) > (iii)$.

The order of decreasing reactivity towards an electrophilic reagent,for the following compounds,is:
$(i) \text{ Benzene} \quad (ii) \text{ Toluene} \quad (iii) \text{ Chlorobenzene} \quad (iv) \text{ Phenol}$

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The order of decreasing reactivity towards an electrophilic reagent,for the following compounds,is: $(i) \text{ Benzene} \quad (ii) \text{ Toluene} \quad (iii) \text{ Chlorobenzene} \quad (iv) \text{ Phenol}$