Reduction of a ketone with sodium borohydride or lithium aluminium hydride gives
Correct answer: C. a secondary alcohol
- A. a primary alcohol
- B. a carboxylic acid
- C. a secondary alcohol
- D. an alkane
Explanation
The hydride ion adds to the carbonyl carbon, which then carries two alkyl groups and a hydroxyl, so the product is a secondary alcohol. An aldehyde reduced in the same way gives a primary alcohol. Reduction is simply the reverse of the oxidation that produced the carbonyl compound in the first place.
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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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679 free Aldehydes and Ketones MCQs from Chemistry, each with the correct answer and an explanation. Unlimited attempts, no account needed.
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