JEE Main & Advanced Chemistry Biomolecules / जैव-अणु Question Bank Proteins, Amino Acids and Enzymes

  • question_answer
    Proteins when heated with conc. \[HN{{O}_{3}}\] give a yellow colour. This is                                     [CPMT 1989]

    A)                 Oxidising test    

    B)                 Xanthoprotic test

    C)                 Hoppe's test     

    D)                 Acid-base test

    Correct Answer: B

    Solution :

               Protein + conc.\[HN{{O}_{3}}\] ® Yellow colour [This test is given by a protein which consists of a-amino acids containing a benzene ring such as tyrosine, phenylalanine etc. The yellow colour is due to nitration of benzene ring.]


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