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Topic Question Set

Q 1 :

Which of the following gives a positive test with ninhydrin?                  [2024]

  • Egg albumin

     

  • Starch

     

  • Polyvinyl chloride

     

  • Cellulose

     

(1)

The ninhydrin test is a chemical test which is used to check the presence of amines or α-amino acids in a given compound. In this test, ninhydrin (2, 2-dihydroxyindane-1, 3-dione) is added to a test solution of the analyte. The development of a deep blue color indicates the presence of ammonia, primary/secondary amines, or amino acids in the analyte.

 

Q 2 :

Match List I with List II:                  [2023]

  List I   List II
  Test   Functional group/Class of Compound
A. Molisch’s Test I. Peptide
B. Biuret Test II. Carbohydrate
C. Carbylamine Test III. Primary amine
D. Schiff’s Test IV. Aldehyde

Choose the correct answer from the options given below:

  • (A)–III, (B)–IV, (C)–II, (D)–I

     

  • (A)–II, (B)–I, (C)–III, (D)–IV

     

  • (A)–III, (B)–IV, (C)–I, (D)–II

     

  • (A)–I, (B)–II, (C)–III, (D)–IV

     

(2)

Biuret test is given by all proteins and peptides having at least two peptide linkages.

Hence positive test must be given by tripeptide and Biuret.

 

Q 3 :

Number of compounds from the following which will not produce orange red precipitate with Benedict solution is ______.

Glucose, maltose, sucrose, ribose, 2-deoxyribose, amylose, lactose                          [2023]



(2)

Sucrose and amylose are non-reducing carbohydrates.