In the reduction of an unsaturated aldehyde or ketone using H₂ in the presence of a transition metal catalyst, which of the following statements is true? A) Both the C=C and C=O bonds are reduced at the same rate. B) The C=C bond is reduced more rapidly than the C=O bond. C) The C=O bond is reduced more rapidly than the C=C bond. D) Unsaturated aldehydes and ketones do not undergo reduction under these conditions.

Question

Quizplus · Accepted Answer

In the presence of H₂ and a transition metal catalyst, the C=C bond is reduced more rapidly than the C=O bond. This is due to the fact that the double bond in the C=C group is less stable than the double bond in the C=O group, making it more reactive towards reduction. Therefore, the C=C bond is preferentially reduced before the C=O bond.

In the Reduction of an Unsaturated Aldehyde or Ketone Using