Question: Aldehydes that have no a hydrogen undergo an intermolecular oxidation-reduction called the Cannizzaro reaction when they are treated with concentrated base. An example is the

Aldehydes that have no a hydrogen undergo an intermolecular oxidation-reduction called the Cannizzaro reaction when they are treated with concentrated base. An example is the following reaction of benzaldehyde:

(a) When the reaction is carried out in D2O, the benzyl alcohol that is isolated contains no deuterium bound to carbon. It is C6H5CH2OD. What does this suggest about the mechanism for the reaction?
(b) When (CH3)2CHCHO and Ba(OH)2/H2O are heated in a sealed tube, the reaction produces only (CH3)2CHCH2OH and [(CH3)2CHCO2]2Ba. Provide an explanation for the formation of these products.

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