The red brown ppt. of Fehling solution and Benedict solution tests are of:
Correct answer: C. Cu2O
- A. Ag
- B. CuO
- C. Cu2O
- D. AgBr
Explanation
Cu2O is the red brown pptFehling's Solution Test [an alkaline solution containing a cuprictartrate complex ion]: Aliphatic aldehydes form a brick-red precipitate withFehling's solution. To an aldehyde solution, add Fehling's solution and boil. Abrick red precipitate of cuprous oxide is formed. Ketones do not give this test.Benedict's Solution Test |an alkaline solution containing a cupriccitrate complex ion]: Aliphatic aldehydes form a brick-red precipitatewith Benedicts's solution. To an aldehyde solution, add Benedict'ssolution and boil. A brick-red precipitate of cuprous oxide is formed
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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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