Discussion
For two parallel reactions where the wanted one has the higher order in the reactant, selectivity is improved by
Answer: B
Correct answer: keeping the reactant concentration high
With \( r_D \propto C^{a} \) and \( r_U \propto C^{b} \), the ratio goes as \( C^{a-b} \). If the wanted reaction has the higher order the exponent is positive, so selectivity rises with concentration - which argues for a batch or plug flow reactor, high pressure in the gas phase, and no dilution. Long residence time works the other way, since it reduces the concentration.
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