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Microwave heating can make a synthesis greener by

  • A.lowering the activation energy of the reaction
  • B.removing the need for any solvent in every case
  • C.changing the reaction's atom economy
  • D.heating the reacting mixture directly and rapidly

Answer: D

Correct answer: heating the reacting mixture directly and rapidly

Microwaves are absorbed by the polar molecules of the mixture itself, so the contents are heated directly rather than through the vessel wall, and heating is fast and uniform. Reaction times can fall from hours to minutes, which saves energy. The activation energy and the atom economy are properties of the chemistry and are unchanged.

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