Which of the following reaction is not shown by ketones?
Correct answer: D. reaction with Fehling
- A. reaction with HCN
- B. reaction with NaHSO4
- C. reaction with 2,4 dinitrophenyl hydrazine
- D. reaction with Fehling
Explanation
While ketones are versatile reagents involved in numerous reactions, they refuse to play nice with Fehling's solution. This blue-hued concoction readily oxidizes aldehydes to carboxylic acids, changing its own color and forming a red precipitate. But ketones, with their less reactive carbonyl groups, simply shrug off Fehling's advances, leaving the solution unchanged.
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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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