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B
1, 3, 5 and 7 position
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C
1, 3, 7 and 9 position
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D
1, 2, 6 and 8 position
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Solution
The correct option is D 1, 3, 7 and 9 position Purines consist of a six-membered and a five-membered nitrogen containing ring, fused together. It possesses nitrogen at 1,3,7 and 9th position.