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Assertion (A): A plug flow reactor is preferred when the wanted parallel reaction has the higher order.
Reason (R): It maintains a high reactant concentration through most of its length.

  • A.A is true but R is false
  • B.A is false but R is true
  • C.Both A and R are true, and R is the correct explanation of A
  • D.Both A and R are true, but R is not the correct explanation of A

Answer: C

Both are true and the reason gives the mechanism: a stirred tank holds everything at the exit concentration, which is exactly where the higher order reaction is at its greatest disadvantage. Concentration is the lever when orders differ.

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