Which of the following reagents will react with both aldehydes and ketones ?
Correct answer: A. Grignard reagent
- A. Grignard reagent
- B. Tollens reagent
- C. Fehlings reagent
- D. Benedicts reagent
Explanation
Grignard reagents add to the electrophilic carbonyl carbon of both aldehydes and ketones, producing alcohols after hydrolysis. Tollens, Fehling's and Benedict's reagents are mainly oxidation tests for aldehydes, so a student may incorrectly select one of them by focusing only on carbonyl compounds generally.
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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.
Practise Aldehydes and Ketones
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