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

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$III < I < II$

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(A) The reactivity of aromatic compounds towards electrophilic aromatic substitution depends on the electron density of the benzene ring. Electron-donating groups increase reactivity,while electron-withdrawing groups decrease it.$I$: Chlorobenzene ($Cl$ is a deactivating group due to its strong $-I$ effect,though it is ortho/para directing).$II$: Toluene ($-CH_3$ is an activating group due to $+I$ and hyperconjugation).$III$: Acetophenone ($-COCH_3$ is a strongly deactivating group due to $-I$ and $-M$ effects).Comparing the effects:$II$ (activating) > $I$ (weakly deactivating) > $III$ (strongly deactivating).Therefore,the increasing order of reactivity is $III < I < II$.

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

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