During 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
The BH4- ion from NaBH4 attacks the carbonyl carbon of the aldehyde, forming an alkoxide intermediate. Therefore, option d is correct.
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About Aldehydes and Ketones
Aldehydes and ketones contain the polar carbonyl group, but aldehydes are generally more readily oxidised and more reactive than ketones. Coverage includes preparation by oxidation or reduction routes, nucleophilic addition of reagents such as hydrogen cyanide and bisulfite, and tests that distinguish aldehydes from ketones.
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