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

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$P > Q > R > S$

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(A) 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 nucleophilic attack on the aromatic ring to form a Meisenheimer complex.The rate of this reaction is primarily determined by the electron-withdrawing effect of the halogen atom ($-I$ effect), which stabilizes the negative charge in the transition state (Meisenheimer complex).Since fluorine is the most electronegative halogen, it exerts the strongest $-I$ effect, making the aromatic ring most electron-deficient and thus most reactive towards nucleophilic attack.The reactivity order for $S_NAr$ is $F > Cl > Br > I$.Therefore, the correct decreasing order of reactivity is $P (F) > Q (Cl) > R (Br) > S (I)$.

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

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