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Practical Organic Chemistry question

2021 · 26 Feb · Shift 2 · Q16
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Practical Organic Chemistry question

2021 · 26 Feb · Shift 2 · Q16

JEE MainChemistryPractical Organic ChemistryMCQ+4 / −1
Seliwanoff test and Xanthoproteic test are used for the identification of ‾\underline{\hspace{2cm}}​ and ‾\underline{\hspace{2cm}}​ respectively.
  1. A
    ketoses, proteins
  2. B
    proteins, ketoses
  3. C
    aldoses, ketoses
  4. D
    ketoses, aldoses
View written solutionFree

Correct answer: A

  1. Identify what each test detects

    (i) Seliwanoff test

    • This test is used to distinguish ketoses from aldoses.
    • In this test, ketoses dehydrate rapidly in acid medium to form compounds that react with resorcinol to give a cherry-red color.
    • Hence, Seliwanoff test is for ketoses.

    (ii) Xanthoproteic test

    • This test is used for proteins containing aromatic amino acids such as tyrosine, tryptophan, and phenylalanine.
    • On treatment with concentrated nitric acid, a yellow color appears due to nitration of the aromatic ring.
    • Hence, Xanthoproteic test is for proteins.

  2. Match with the options

    We need: Seliwanoff test→ketoses,Xanthoproteic test→proteins\text{Seliwanoff test} \to \text{ketoses}, \qquad \text{Xanthoproteic test} \to \text{proteins}Seliwanoff test→ketoses,Xanthoproteic test→proteins

    So the correct option is:

    • A: ketoses, proteins

  3. Final answer

    A\boxed{\text{A}}A​

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