Consider the reactions :

Identify A, X, Y and Z

A

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

B

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

C

A-Methoxymethane, X-Ethanoic acid, Y-Acetateion, Z-hydrazine

D

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