science
Grade-10
Easy

Question

Which of the following base analogs exhibit tautomerism?

  1. 5-bromouracil.

  2.  2-aminopurine.

  3.  6-mercaptopurine.

  4. Acycloguanosine

hintHint:

It is a base analogue for thymine.

The correct answer is:

5-bromouracil.


    • Tautomerism is a type of structural isomerism
    • Tautomerism is formed due  to change in the location of H atom
    • To understand more on tautomerism:
    • This type of tautomerism is found in 5BromoUracil with 3 isomeric forms
    • The structure of isomers of 5BU: 

    • Base analogues have structure similar to the common bases (Adenine, guanine, cytosine and thymine)
    • 5bromouracil is the base analogue for thymine

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