Which of the following tests helps us to distinguish between aldehyde and ketone?
Correct answer: C. Both A and B
- A. Fehling's solution test
- B. Tollens's reagent test
- C. Both A and B
- D. Baeyer's test
Explanation
Both Fehling's solution test and Tollens's reagent test are commonly used to distinguish between aldehydes and ketones.(a) Fehling's solution test: Fehling's solution is a chemical reagent used to differentiate between aldehydes and ketones based on their ability to oxidize. Aldehydes are oxidized by Fehling's solution to form carboxylic acids, while ketones do not react. This test is positive for aldehydes and negative for ketones.(b) Tollens's reagent test: Tollens's reagent, also known as the silver mirror test, is used to distinguish between aldehydes and ketones based on their ability to undergo oxidation. Tollens's reagent consists of silver nitrate (AgNO3) dissolved in aqueous ammonia. Aldehydes react with Tollens's reagent to form a silver mirror (silver precipitate), while ketones do not react. This test is positive for aldehydes and negative for ketones.
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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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