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The desired liquid-phase reaction

$D+E\overset{k_{1}}{\rightarrow}F \:\:\:\:\:\:\:\:\:r_{F}=k_{1}\:C_{D}^{2}\:C_{E}^{0.3}$

is accompanied by an undesired side reaction

$D+E\overset{k_{2}}{\rightarrow}G \:\:\:\:\:\:\:\:\:r_{G}=k_{2}\:C_{D}^{0.4}\:C_{E}^{1.5}$

Four isothermal reactor schemes ($CSTR$: ideal Continuous-Stirred Tank Reactor; $PFR$: deal Plug Flow Reactor) for processing equal molar feed rates of $D$ and $E$ are shown in figure. Each scheme is designed for the same conversion. The scheme that gives the most favorable product distribution is:

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