Sign in
12thPass logo
New chatPYQ LibraryDoubtsRank report
Sign in to see Recents

Your guest activity stays on this device

Sign in to save progress →
Sign in

Practical Organic Chemistry question

2021 · 27 Aug · Shift 2 · Q10
Guest · filters and generic practice availableBrowsing as a guest · PYQ filters and generic practice are available. Sign in only for personalised features and saved progress.
  1. PYQ Library
  2. /JEE Main
  3. /Chemistry
  4. /Practical Organic Chemistry
  5. /2021 · 27 Aug · Shift 2 · Q10

Practical Organic Chemistry question

2021 · 27 Aug · Shift 2 · Q10

JEE MainChemistryPractical Organic ChemistryMCQ+4 / −1
Which one of the following tests used for the identification of functional groups in organic compounds does not use copper reagent?
  1. A
    Barfoed's test
  2. B
    Seliwanoff's test
  3. C
    Benedict's test
  4. D
    Biuret test for peptide bond
View written solutionFree

Correct answer: B

  1. We need to identify which test does not use a copper reagent.

  2. Check each option:

    A. Barfoed's test

    • Barfoed's reagent is copper(II) acetate in acetic acid.
    • So, it uses copper.

    B. Seliwanoff's test

    • Seliwanoff's reagent contains resorcinol and concentrated HCl.
    • It is used to distinguish ketoses from aldoses.
    • It does not use copper.

    C. Benedict's test

    • Benedict's reagent contains copper(II) sulfate, sodium citrate, and sodium carbonate.
    • So, it uses copper.

    D. Biuret test for peptide bond

    • Biuret test uses copper(II) sulfate in alkaline medium.
    • So, it uses copper.

  3. Therefore, the only test that does not use a copper reagent is:

B. Seliwanoff’s test\boxed{\text{B. Seliwanoff's test}}B. Seliwanoff’s test​

  1. Comparison with stored correct answer:
  • Stored correct answer: B
  • Derived answer: B
  • They agree.
PreviousNext

More from Practical Organic Chemistry

  • An organic compound is subjected to chlorination to get compound A using 5.0 g of chlorine. When 0.5 g of compound A is reacted with AgNO3​ [Carius Method], the percentage of chlorine in compound A is ​ when it…2021 · Numerical
  • The transformation occurring in Duma's method is given below : C2​H7​N+(2x+2y​)CuO→xCO2​+2y​H2​O+2z​N2​+(2x+2y​)Cu The value of y is ​…2021 · Numerical
  • In Carius method of estimation of halogen, 0.172 g of an organic compound showed presence of 0.08 g of bromine. Which of these is the correct structure of the compound?2020 · MCQ
  • If you spill a chemical toilet cleaning liquid on your hand, your first aid would be2020 · MCQ
  • In an estimation of bromine by Carius method, 1.6 g of an organic compound gave 1.88 g of AgBr. The mass percentage of bromine in the compound is ​. (Atomic mass, Ag = 108, Br = 80 g mol–1)2020 · Numerical
  • A, B and C are three biomolecules. The results of the tests performed on them are given below:  A  B  C ​ Molisch’s  Test ​ Positive  Positive  Negative ​ Barfoed  Test ​ Negative  Positive  Negative ​ Biuret  Test ​ Negative  Negative  Positive ​​…2020 · MCQ
  • An organic compound neither reacts with neutral ferric chloride solution nor with fehling solution. it however, reacts with Grignard reagent and gives positive iodoform test. The compound is :2019 · MCQ
  • An organic compound 'X' showing the following solubility profile is : Includes diagram2019 · MCQ