Fehling's solution works on the principle of redox reaction which results in:
Correct answer: C. Oxidation of aldehyde
- A. Reduction of aldehydes
- B. Oxidation of Copper(II)
- C. Oxidation of aldehyde
- D. Oxidation of Ketone
Explanation
Fehling's solution is specifically designed to test for aldehydes, which are oxidized to carboxylic acids during the reaction. In this process, the Cu²⁺ ions from the Fehling's solution are reduced to Cu₂O, which precipitates as a red solid. Therefore, the correct answer is the oxidation of aldehyde. The other options are incorrect as they either misinterpret the nature of the reaction (like reduction of aldehydes) or focus on the wrong substrate (ketones), which do not react under these conditions. While copper(II) is involved in the reaction, the key reaction occurring is the oxidation of the aldehyde itself.
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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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