Multiple choice

The reaction given by two or more peptide linkages is

  1. Biuret test

  2. Ninhydrin test

  3. Xanthoproteic test

  4. Pauley's test
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A Correct answer
Explanation

Biuret test is specific for compounds containing two or more peptide bonds (-CO-NH-). The peptide bond forms a violet-purple complex with copper(II) ions in alkaline medium. Ninhydrin reacts with free amino groups, xanthoproteic test detects aromatic rings, and Pauly's test is for histidine/imidazole group.

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