The Biuret test is not given by:

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(A) The Biuret test is a chemical test used to detect the presence of peptide bonds ($CONH$ linkage).Since carbohydrates do not contain peptide bonds,

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Carbohydrates

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(A) The Biuret test is a chemical test used to detect the presence of peptide bonds ($CONH$ linkage).Since carbohydrates do not contain peptide bonds,they do not give a positive Biuret test.Polypeptides and proteins contain multiple peptide bonds and thus give a positive test.Urea $(NH_2CONH_2)$ also gives a positive Biuret test because it contains a structure similar to the biuret molecule $(H_2N-CO-NH-CO-NH_2)$.

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