Chemistry · Aldehyde and Ketones: Nature of carbonyl group, nucleophilic addition to >C=O group, relative reactivities of aldehydes and ketones
Which type of reaction in the reduction of carbonyl compound with and occurs, an
Which type of reaction in the reduction of carbonyl compound with \( L A H \) and \( N a B H_{4} \) occurs, and which nucleophile takes part in the reaction?
- A. Nucleophilic addition and \( A l H_{4}^{\ominus} \) or \( B H_{4}^{\text {d }} \)
- B. Nucleophilic addition and \( H^{\ominus} \)
- C. Nucleophilic substitution and \( A l H_{4}^{\ominus} \) or \( B H_{4}^{\text {d }} \)
- D. Nucleophilic substitution and \( H^{\ominus} \)
Step-by-step solution
Reduction of carbonyl compounds with LAH or NaBH4 involves nucleophilic addition of hydride ion (H-) to the electrophilic carbonyl carbon, forming an alkoxide intermediate. The entire complex ion (AlH4- or BH4-) acts as a hydride source, but the actual nucleophile is H-. This is not a substitution reaction.
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