Biuret test is not given by

Biuret test is not given by

  1. A

    proteins

  2. B

    carbohydrates

  3. C

    polypeptides

  4. D

    urea

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    Solution:

    The biuret is NH2CONHCONH When an aqueous biuret solution is treated with sodium hydroxide and a drop of copper sulphate solution, a violet colour is produced. This is known as biuret reaction, which is characteristic of all compounds containing the grouping CONH, e.g.,  proteins, polypeptide and urea (which on gently heated form biuret).

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