Correct answer: (C) A PFR always achieves more overall reaction at the same volume; (D) Kinetics play no role in choosing CSTR versus PFR
Explanation
A and B describe the ideal steady reactor models. Relative conversion depends on rate law: for zero order they can agree, while other kinetics can reverse the usual positive-order PFR advantage. Therefore “always” in C is false, and D is false because kinetics guide selection. Select **C, D**.
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