Consider the reactions,
Identify A, X, Y and Z.
A-Methoxymethane, X-Ethanol,
Y-Ethanoic acid, Z-Semicarbazide.
A-Ethanal, X-Ethanol,
Y-But-2-enal, Z-Semicarbazone.
A-Ethanol, X-Acetalfehyde,
Y-Butanone, Z-Hydrazone.
A-Methoxymethane, X-Ethanoic acid,
Y-Acetate ion, Z-Hydrazine.