Eduprobe
Question:
Consider the reactions: Identify A, X, Y, and Z.
A−Ethanal, X−Ethanol, Y−But−enal, Z−Semicarbazone
A−Ethanol, X−Acetaldehyde, Y−Butanone, Z−Hydrazone
A−Methoxymethane, X−Ethanoic acid, Y−Acetate ion, Z−hydrazine
A−Methoxymethane, X−Ethanol, Y−Ethanoic acid, Z−Semicarbazide
Solution:
A, X, Y, and Z are A−Ethanal, X−Ethanol, Y−But−enal, Z−Semicarbazone respectively. Ethanol is oxidised to ethanal when it is heated with Cu at 573 K. Ethanal gives a silver mirror test as it is an aldehyde. When ethanal is heated in an alkaline medium, it undergoes aldol condensation followed by dehydration to form But−enal, an α−β unsaturated aldehyde. Ethanal reacts with semicarbazide to form semicarbazone.