Question

Consider the reactions:
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

Answer 1

The correct option is C A-ethanal, X-ethanol, Y-but-2-enal, Z-semicarbazone

Since 'A' gives positive silver mirror test therefore, it must be an aldehyde or \alpha-hydroxyketone.
Reaction with semicarbazide indicates that A can be an aldehyde or a ketone.
Reaction with $O{H}^{-}$ i.e., aldol condenstion (by assuming alkali to be dilute) indicates that A is an aldehyde as aldol reaction of ketones is reversible and carried out in a special apparatus.
These indicate option (c):