IIT JAM
   Top Resources
Tejas posted an Question
May 09, 2020 • 20:46 pm 30 points
  • IIT JAM
  • Chemistry (CY)

Is phenylalanine shows xanthoproteic test ? if yes then why?

Is phenylalanine Shows Xanthoproteic test ? If yes then Why?

2 Answer(s) Answer Now
  • 0 Likes
  • 5 Comments
  • 0 Shares
  • Suman Kumar best-answer

    See Xanthoproteic reaction of Tyrosine. Nitration of Tyrosine due to presence of aromatic rind. In the same way phenyl alanine has aromatic ring.You know nitration is a characteristic reaction of benzene ring.

    cropped2046942059620630289.jpg
  • Suman Kumar

    Xanthoproteic test is nothing but the nitration of the phenyl ring. Aromatic amino acids, such as Phenyl alanine, tyrosine and tryptophan, respond to xanthoproteic test. In the presence of concentrated nitric acid, the aromatic phenyl ring is nitrated to give yellow colored nitro-derivatives.  Structure of phenyl alanine. Thus it has phenyl ring.

    cropped8457132098022583742.jpg
  • comment-profile-img>
    Dinesh khalmaniya 1 best-answer

    Some amino acids contain aromatic groups that are derivatives of benzene. These aromatic groups can undergo reactions that are characteristic of benzene and benzene derivatives. One such reaction is the nitration of a benzene ring with nitric acid. The amino acids tyrosine and tryptophan contain activated benzene rings and readily undergo nitration. The amino acid phenylalanine also contains a benzene ring, but the ring is not activated and, therefore, does not readily undergo nitration. This nitration reaction, when used to identify the presence of an activated benzene ring, is commonly known as the xanthoproteic test, because the product is yellow.

    eduncle-logo-app

    Don't misguide our student.

whatsapp-btn

Do You Want Better RANK in Your Exam?

Start Your Preparations with Eduncle’s FREE Study Material

  • Updated Syllabus, Paper Pattern & Full Exam Details
  • Sample Theory of Most Important Topic
  • Model Test Paper with Detailed Solutions
  • Last 5 Years Question Papers & Answers

Sign Up to Download FREE Study Material Worth Rs. 500/-