Question:
What is the color of copper compound formed in Fehling’s test for aliphatic aldehydes?
What is the color of copper compound formed in Fehling’s test for aliphatic aldehydes?
Updated On: Mar 27, 2025
- Green
- Blue
- Yellow
- Red brown
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The Correct Option is D
Solution and Explanation
In Fehling’s test for aliphatic aldehydes, a red-brown precipitate of copper(I) oxide (Cu₂O) is formed.
- Fehling’s solution contains copper(II) ions (Cu²⁺), which are blue in color.
- When an aldehyde is present, it reduces the copper(II) ions to copper(I) ions (Cu⁺), forming a red-brown precipitate of Cu₂O.
- This red-brown color indicates the presence of an aldehyde.
Thus, the color of the copper compound formed is red-brown.
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