Chemical Reaction Engineering
The experimentally determined overall order of the reaction, A + B → C + D, is two. Then the

Reaction is elementary but the molecularity may not be 2
Molecularity of the reaction is 2, but the reaction may not be elementary
Reaction may be elementary with molecularity of 2
Reaction is elementary with a molecularity of 2

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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

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

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Chemical Reaction Engineering
A batch reactor is suitable for

Achieving cent percent conversion of reactants into products
Liquid phase reactions
Large scale gaseous phase reactions
Obtaining uniform polymerisation products in highly exothermic reactions

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