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All of the following improve the yield of a wanted intermediate EXCEPT

  • A.stopping the reaction at the optimum time
  • B.removing the intermediate as it forms
  • C.running the reaction to complete conversion
  • D.using plug flow rather than a stirred tank

Answer: C

Correct answer: running the reaction to complete conversion

Complete conversion is the one thing guaranteed to destroy the intermediate, since with no reactant left the second step continues unopposed and converts B into C. The others all help: stopping at the optimum time, removing the intermediate as it forms so it cannot react further, and using plug flow so that no material lingers past the optimum.

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