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(A) The reactivity of aromatic compounds towards electrophilic substitution depends on the electron density of the benzene ring. Electron-donating gro

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$D < A < C < B$

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(A) The reactivity of aromatic compounds towards electrophilic substitution depends on the electron density of the benzene ring. Electron-donating groups $(EDG)$ increase reactivity,while electron-withdrawing groups $(EWG)$ decrease it.$A$: Chlorobenzene ($-Cl$ group has $-I$ effect and $+R$ effect; overall,it is deactivating but ortho/para directing).$B$: Anisole ($-OMe$ group has strong $+R$ effect,making it highly activating).$C$: Toluene ($-Me$ group has $+I$ and hyperconjugation effect,making it activating).$D$: Benzonitrile ($-CN$ group has strong $-R$ and $-I$ effects,making it strongly deactivating).Comparing the effects:$B$ (strong $+R$) > $C$ (hyperconjugation) > $A$ (deactivating $-I > +R$) > $D$ (strong $-R$ and $-I$).Thus,the increasing order of reactivity is $D < A < C < B$.

The increasing order of reactivity of the following compounds towards aromatic electrophilic substitution reaction is:

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