Question #45053

Consider the $S_NAr$ reactions of 1-fluoro-2,4-dinitrobenzene (\textbf{I}) and 1-chloro-2,4-dinitrobenzene (\textbf{II}) at 298 K under two different conditions:\n\nReaction 1: \textbf{I} and \textbf{II} with $NaOMe$ in DMSO. (Second-order rate constants: $k_{I,1}$ and $k_{II,1}$)\nReaction 2: \textbf{I} and \textbf{II} with $KO^tBu$ in DMSO. (Second-order rate constants: $k_{I,2}$ and $k_{II,2}$)\n\nLet 'Attack' denote the formation of the Meisenheimer complex and 'Cleavage' denote the breaking of the carbon-halogen bond. Which of the following correctly identifies the relative rate constants and the rate-determining step (RDS) for each reaction?