Chemical Reaction Engineering
For reactions in parallel viz A → P (desired product) and A → Q (unwanted product), if the order of the desired reaction is higher than that of the undesired reaction, a

Single CSTR is the most suitable
Batch reactor is preferred over a single CSTR for high yield
Tubular reactor is preferred over a single CSTR for high yield
Both A and B

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Chemical Reaction Engineering
In case of staged packed bed reactors carrying out exothermic reaction, use

Plug flow for dilute liquid requiring no large preheating of feed
High recycle for pure gas
All of these
Cold shot operations for a dilute solution requiring large preheating to bring the stream upto the reaction temperature

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