f$)$ For the following set of liquid reactions, describe all possible reactor systems and conditions to maximize the selectivity to D$.$ Make sketches where necessary to support your choices. The rates are in $(\frac{\text{m}\text{o}\text{l}}{d{m}^2*s})$ and concentrations are in $(\frac{\text{m}\text{o}\text{l}}{d{m}^3}).$

$(1)$ A $+$ B $>$D $-$rA$1=10$ exp$(-8000$K$/$T$)$CaCb

$(2)$ A $+$ B$>$U $-$r$2$a$=100$exp$(-1000$K$/$T$)$CA$^1/2$CB$^3/2$

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Marks$|$