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Question:

Which of the following tests cannot be used for identifying amino acids?

Barfoed test

Ninhydrin test

Biuret test

Xanthoproteic test

Solution:

The correct option is Barfoed test. Barfoed's test is a chemical test used for detecting the presence of monosaccharides. It is based on the reduction of Copper (II) acetate to Copper (I) oxide, which forms a brick-red precipitate. Biuret test, Xanthoproteic test, and Ninhydrin test are used for identifying Amino Acids.