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Consider the reactions: X → Cu 573K → [Ag(NH3)2]+ → Silver mirror observed → Y OH− Δ → Z NH2−NH−C−NH2 Identify A, X, Y and Z

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

Correct answer: A-Ethanol, X-Acetaldehyde, Y-Butanone, Z-Hydrazone

Solution

The reaction sequence suggests that X is acetaldehyde, as it forms a silver mirror with Tollen's reagent. Y is butanone, formed via aldol condensation, and Z is hydrazone, formed by reaction with hydrazine.

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