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(A) Nucleophilic aromatic substitution reactions are facilitated by the presence of electron-withdrawing groups $(EWG)$ on the benzene ring,which stab

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p-Nitrochlorobenzene

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(A) Nucleophilic aromatic substitution reactions are facilitated by the presence of electron-withdrawing groups $(EWG)$ on the benzene ring,which stabilize the negatively charged intermediate (Meisenheimer complex).$1$. The $-NO_2$ group is a strong electron-withdrawing group ($-I$ and $-M$ effect),which significantly stabilizes the intermediate.$2$. The $-OCH_3$ group is an electron-donating group ($+M$ effect),which destabilizes the intermediate.$3$. The $-CH_3$ group is an electron-donating group ($+I$ and hyperconjugation),which destabilizes the intermediate.$4$. The $-Cl$ group is weakly electron-withdrawing ($-I$ effect) but also electron-donating ($+M$ effect),making it less effective than $-NO_2$ at stabilizing the intermediate.Therefore,$p$-Nitrochlorobenzene is the most reactive towards nucleophilic substitution.

Which of the following compounds is most reactive towards nucleophilic substitution reaction?

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