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

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

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Chemical Reaction Engineering
The reactions of high molecularity are rare, because

Of very large activation energy of many bodies
Of requirement of very large concentration for such reactions
Of low probability of many body collisions
Many body collisions are not favoured energetically

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