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(B) The reaction of haloarenes with $Na^{\oplus} O^{\ominus} Me$ (sodium methoxide) is a Nucleophilic Aromatic Substitution $(S_NAr)$ reaction. In $S_

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$S > R > Q > P$

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(B) The reaction of haloarenes with $Na^{\oplus} O^{\ominus} Me$ (sodium methoxide) is a Nucleophilic Aromatic Substitution $(S_NAr)$ reaction. In $S_NAr$ reactions,the rate-determining step is the attack of the nucleophile on the aromatic ring to form a Meisenheimer complex. The presence of an electron-withdrawing group (like $-NO_2$) at the ortho or para position facilitates this attack. Since all compounds have a $-NO_2$ group at the para position,the rate of reaction depends on the ease of the leaving group departure. The leaving group ability follows the order: $I^- > Br^- > Cl^- > F^-$. Therefore,the reactivity order towards nucleophilic substitution is $S (I) > R (Br) > Q (Cl) > P (F)$.

The decreasing order of reactivity of the following compounds towards $Na^{\oplus} O^{\ominus} Me$ is:

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