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(A) The reactivity of aromatic compounds towards electrophilic aromatic substitution (like monobromination) depends on the electron density of the ben

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$I > III > II > IV$

Vedclass · Answer

(A) The reactivity of aromatic compounds towards electrophilic aromatic substitution (like monobromination) depends on the electron density of the benzene ring. Electron-donating groups $(EDG)$ increase the electron density and reactivity,while electron-withdrawing groups $(EWG)$ decrease it. $I$: Toluene ($-CH_3$ group is an $EDG$,activates the ring). $III$: Benzene (reference compound). $II$: Benzoic acid ($-COOH$ group is a strong $EWG$,deactivates the ring). $IV$: Nitrobenzene ($-NO_2$ group is a very strong $EWG$,strongly deactivates the ring). Therefore,the order of reactivity is $I > III > II > IV$.

What is the correct order of decreasing reactivity for the monobromination of the following compounds?

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