During the reduction of aldehydes with NaBH4, which of the following intermediate is formed?
Correct answer: D. Alkoxide ion
- A. Carbanion
- B. Carbocation
- C. Carbene
- D. Alkoxide ion
Explanation
During the reduction of aldehydes with NaBH4, the "alkoxide ion" is seen as the intermediate formed hence the answer is D.
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About Nucleophilic Addition Reactions
Nucleophilic addition occurs at the polar carbonyl group of aldehydes and ketones, where a nucleophile attacks the electron-deficient carbon atom. Reactions with hydrogen cyanide, sodium bisulfite, alcohols and Grignard reagents are explained through tetrahedral intermediates, acid or base catalysis, and the different reactivity of aldehydes and ketones.
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