Discussion
Fehling's reagent is a mixture of
Answer: D
Fehling's reagent is a mixture of aqueous \(CuSO_{4}\) and alkaline sodium potassium tartrate (printed 'tatarate').
Fehling's solution A is aqueous copper(II) sulphate; Fehling's solution B is alkaline sodium potassium tartrate (Rochelle salt). The tartrate complexes the \(Cu^{2+}\) and keeps it in solution in the alkaline mixture. Aldehydes reduce it to a red-brown precipitate of \(Cu_{2}O\).
Ammoniacal silver nitrate is Tollens' reagent, and 2,4-DNP is a test for carbonyl groups in general, not part of Fehling's reagent. KOH with tartrate alone lacks the copper.
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