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Of the following reaction types, the one with the lowest atom economy is generally

  • A.rearrangement
  • B.concerted cycloaddition
  • C.elimination
  • D.addition

Answer: C

Correct answer: elimination

An elimination discards a fragment from the substrate itself, so mass is lost from the very molecule being built and none of it can be recovered in the product. Rearrangement and cycloaddition retain all the atoms and addition combines both reactants entirely, so all three score far better.

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