Question
Consider the reactions :
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A-Methoxymethane, X-Ethanoic acid, Y-Acetate ion, Z-hydrazine
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A-Methoxymethane, X-Ethanol, Y-Ethanoic acid, Z-Semicarbazide
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A-Ethanal, X-Ethanol, Y-But-2-enal, Z-Semicarbazone
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A-Ethanol, X-Acetaldehyde, Y-Butanone, Z-Hydrazone
Solution
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 α-hydroxy ketone.
Reaction with semicarbazide indicates that A can be an aldehyde or ketone.
Reaction with OH– i.e., aldol condensation (by assuming alkali to be dilute) indicates that A is aldehyde as aldol reaction of ketones is reversible and carried out in special apparatus.
