What functional group gives a positive test in the xanthoproteic test?

Aromatic amino acids, due to the nitration of amino acids.

Explanation:

Xanthoproteic test is a chemical test used to determine the amount of the protein in a solution. This is a type of qualitative test used for the determination of presence or absence of protein.

The xanthoproteic test is positive in case of aromatic amino acids only. The yellow color is formed in case of aromatic amino acids due to the formation of xanthoproteic acid. Phenylalanine, tyrsoine and tryptophan gives positive xanthoproteic test.

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