An aldehyde when boiled with fehling solution gives brick red preciptate, red colour is due to
Correct answer: C. Cuprous oxide
- A. Ag
- B. Cuprix oxide
- C. Cuprous oxide
- D. Soduim carboxylate
Explanation
Fehling's solution is alkaline solution containing cupric tartarate ion. This cupric ion reduced to brick red coloured cuprous oxide (Cu2O) by an aliphate aldehyde.
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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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