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Consider the reactions:
Identify A, X, Y and Z
Identify A, X, Y and Z
Explanation
Dehydrogenation of ethanol gives ethanal, which shows Tollens', aldol and semicarbazone reactions.
Detailed Solution
Since 'A' gives a positive silver mirror test, it must be an aldehyde or an $\alpha$-hydroxyketone.
Reaction with semicarbazide indicates that A can be an aldehyde or ketone.
Reaction with dilute $OH^-$ (aldol condensation) indicates that A is an aldehyde, as the aldol reaction of ketones is reversible and needs special apparatus.
Reaction with semicarbazide indicates that A can be an aldehyde or ketone.
Reaction with dilute $OH^-$ (aldol condensation) indicates that A is an aldehyde, as the aldol reaction of ketones is reversible and needs special apparatus.