Question

The positions of nitrogen in purines are

• A. 1, 3, 5, 7
• B. 1, 5, 7, 9
• C. 1, 3, 6, 7
• D. 1, 3 7, 9

Answer 1

The correct option is D 1, 3 7, 9

Purine is a heterocyclic aromatic nitrogenous base. It has nitrogen (N) present in the positions 1,3,7, and 9.