Which of the following reactions is NOT shown in ketones?
Correct answer: D. Reaction with Fehling's Solution
- A. Nucleophilic Addition Reactions
- B. Reduction to Alcohols
- C. Formation of Hydrazones
- D. Reaction with Fehling's Solution
Explanation
Fehling's solution is used to test for the presence of reducing sugars and aldehydes. Ketones do not typically react with Fehling's solution because they lack the necessary functional group (an aldehyde) to reduce the copper(II) ion in the solution to copper(I) oxide. This is why ketones do not show a positive test with Fehling's solution.Conclusion: The correct answer is Fehling's Solution, which ketones do not react with, while the other options represent reactions that ketones typically undergo.
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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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