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Topic: Alcohols: identification of 1/2/3 alcohols, dehydration mechanism· Organic Compounds Containing Oxygen

Consider the reactions :X\ (C_2H_6O) Cu/573\ K A [Ag(NH_3)_2]^+,\ ^-OH,Δ Silver mirror observed; A ^-OH,Δ Y; A NH_2-NH-C(=O)-NH_2 ZIdentify A, X, Y and Z

Consider the reactions :

\(X\ (C_2H_6O) \xrightarrow{Cu/573\ K} A \xrightarrow{[Ag(NH_3)_2]^+,\ ^-OH,\Delta}\) Silver mirror observed; \(A \xrightarrow{^-OH,\Delta} Y\); \(A \xrightarrow{NH_2-NH-C(=O)-NH_2} Z\)

Identify A, X, Y and Z

reaction scheme for X, A, Y, Z

1. A-Methoxymethane, X-Ethanol, Y-Ethanoic acid, Z-Semicarbazide.

2. A-Ethanal, X-Ethanol, Y-But-2-enal, Z-Semicarbazone.

3. A-Ethanol, X-Acetaldehyde, Y-Butanone, Z-Hydrazone.

4. A-Methoxymethane, X-Ethanoic acid, Y-Acetate ion, Z-hydrazine.

1 answer

Best answer

Answer: 2. A-Ethanal, X-Ethanol, Y-But-2-enal, Z-Semicarbazone.

Key idea: \(\mathrm{C_2H_6O}\) with Cu/573 K dehydrogenation means a primary alcohol.

  • X = ethanol, oxidised (dehydrogenated) by hot Cu to A = ethanal.
  • A gives silver mirror with Tollens' reagent (aldehyde).
  • With dilute alkali and heat, ethanal undergoes aldol condensation giving Y = but-2-enal.
  • With semicarbazide, ethanal gives Z = semicarbazone.

This matches option 2.

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report
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