Which one of the following tests used for the identification of functional groups in organic compounds does not use copper reagent?

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Canvas Classes · Accepted Answer

Copper-containing reagents in biochemical tests:

| Test | Reagent | Contains Cu? |
|---|---|---|
| Seliwanoff's test | Resorcinol in HCl | No copper ✓ |
| Biuret test | CuSO₄ in NaOH | Yes — Cu²⁺ |
| Barfoed's test | Copper acetate in acetic acid | Yes — Cu²⁺ |
| Benedict's test | CuSO₄ + Na₂CO₃ + sodium citrate | Yes — Cu²⁺ |

Seliwanoff's test uses resorcinol (1,3-dihydroxybenzene) dissolved in HCl — no copper at all. It detects ketoses (fructose) by forming a cherry-red colour.

All other op

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