Choice B is correct. DIBAL-H forms a complex with the carbonyl carbon and the oxygen.Eventually it transfers an proton and releases the alkoxide portionof the cpd. The double- bonded O reforms. Addition of waterhydrolyzes the Aluminum complex and releases it, leaving thealdehyde. Hope this helps, Steve Solution Choice B is correct. DIBAL-H forms a complex with the carbonyl carbon and the oxygen.Eventually it transfers an proton and releases the alkoxide portionof the cpd. The double- bonded O reforms. Addition of waterhydrolyzes the Aluminum complex and releases it, leaving thealdehyde. Hope this helps, Steve.