Question:

Seliwanoff test and Xanthoproteic test are used for the identification of ___________ and ________ respectively.

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Seliwanoff's reagent (resorcinol in HCl) detects ketoses; the xanthoproteic test (conc. \(\mathrm{HNO_3}\)) detects aromatic amino acids in proteins.
Updated On: Nov 4, 2026
  • ketoses, proteins
  • proteins, ketoses
  • aldoses, ketoses
  • ketoses, aldoses
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The Correct Option is A

Solution and Explanation

Seliwanoff test: resorcinol with conc. HCl gives a cherry-red colour quickly with ketoses (e.g. fructose); aldoses react only slowly.
Xanthoproteic test: conc. \(\mathrm{HNO_3}\) nitrates the benzene ring of aromatic amino acids (tyrosine, phenylalanine, tryptophan), giving a yellow colour that turns orange with alkali. It identifies proteins.
So the blanks are ketoses and proteins respectively.
Answer: (1) ketoses, proteins
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