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JEE Advanced levelOne or more correct optionsDifficulty 3 of 3co165

Which statements about the Meerwein-Ponndorf-Verley (MPV) and Oppenauer reactions are correct?

  1. AMPV reduction is reversible and is driven forward by distilling out the propanone formed
  2. BOppenauer oxidation uses a large excess of propanone to drive the oxidation of a secondary alcohol to a ketone
  3. CMPV reduction of but-2-enal with aluminium isopropoxide gives butan-1-ol
  4. DOppenauer oxidation of cyclohexanol gives hexanedioic acid

Answer: A, B

Both reactions are the same aluminium-alkoxide-catalysed hydride transfer, so the equilibrium is shifted by removing propanone (MPV) or by excess propanone (Oppenauer). MPV leaves C=C intact, giving but-2-en-1-ol, and Oppenauer stops at the ketone, cyclohexanone.
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