JEE Main · 2021 · 27 Aug 2021 · Shift 2 · Practical and Analytical Chemistry

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

(A)Biuret test for peptide bond
(B)Benedict's test
(C)Barfoed's test
(D)Seliwanoff's test✓ Correct

Answer: (D)

Solution

The biuret test for the peptide linkage, Benedict's test for reducing sugars and Barfoed's test all use copper(II) in solution (alkaline cupric sulphate, or cupric acetate for Barfoed's). Seliwanoff's test, which distinguishes ketoses from aldoses, uses resorcinol in dilute hydrochloric acid and contains no copper. The test that does not use a copper reagent is Seliwanoff's test.

JEE Main · 2021 · 27 Aug 2021 · Shift 2 · Single correct option

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