Q. Consider the reactions : X ($C_2H_6O$) $\xrightarrow{Cu/573\ K}$ A A $\xrightarrow{[Ag(NH_3)_2]^+,\ OH^-,\ \Delta}$ Silver mirror observed A $\xrightarrow{OH^-,\ \Delta}$ Y A + $NH_2-NH-CO-NH_2$ $\rightarrow$ Z Identify A, X, Y and Z
A) A-Methoxymethane, X-Ethanoic acid, Y-Acetate ion, Z-hydrazine.
B) A-Methoxymethane, X-Ethanol, Y-Ethanoic acid, Z-Semicarbazide.
C) A-Ethanal, X-Ethanol, Y-But-2-enal, Z-Semicarbazone.
D) A-Ethanol, X-Acetaldehyde, Y-Butanone, Z-Hydrazone.
Explanation
[Solution] Ethanol (X) is dehydrogenated by Cu to ethanal (A), which gives Tollens' test, undergoes aldol condensation to but-2-enal (Y) and forms a semicarbazone (Z). Answer (3).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.