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A. Alkaline solution of copper sulphate and sodium citrate → III (Aldehydes)
Reason: This chemical mixture describes Benedict's Reagent. It oxidizes aliphatic aldehydes, reducing the copper(II) complex into a red copper(I) oxide precipitate. It matches with III which features an aldehyde group (—CHO).
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Reason: Neutral ferric chloride serves as the classic diagnostic indicator for enols and phenolic —OH systems, creating highly colored coordination complexes (typically violet/purple). It matches with IV (Phenol structure).
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Reason: Chloroform in an alkaline environment (CHCl_3 + KOH) is the basis for the Carbylamine Test / Isocyanide Test. This test reacts exclusively with aliphatic or aromatic 1° amines to emit a foul-smelling foul odor. It matches with II (Isopropylamine).
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Reason: Lucas reagent (HCl +ZnCl2 )acts as a test to differentiate primary, secondary, and tertiary structures containing an alcohol function group by forming insoluble alkyl chlorides. It matches with I (Benzyl alcohol variant).
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