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Clemmensen reduction of propanone: The carbonyl group is reduced to –CH2– by zinc amalgam and concentrated HCl:

CH3COCH3 + 4[H] —(Zn-Hg, conc. HCl)→ CH3CH2CH3 (propane) + H2O

Fehling’s test for ethanal: Fehling’s solution (Fehling A: aqueous CuSO4; Fehling B: alkaline sodium potassium tartrate) is mixed in equal volumes and warmed with ethanal. A red-brown precipitate of cuprous oxide is formed, because ethanal is oxidised to the acetate ion:

CH3CHO + 2Cu2+ + 5OH− → CH3COO− + Cu2O↓ (red) + 3H2O

Doubtly AI · 29 Oct 2026 AI-verified · Nov 2026 Report
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