Which compound gives a red-brown precipitate when warmed with Fehling’s solution?
Correct answer B. Propanal
Explanation
Aliphatic aldehydes reduce the Cu²⁺ in Fehling's solution to red-brown copper(I) oxide, Cu₂O. Ketones are not oxidised, and aromatic aldehydes such as benzaldehyde do not usually give a positive Fehling's test.
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