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Purine has four nitrogen's , which of th...

Purine has four nitrogen's , which of the following are you expect to be basic ?

A

`N_1`

B

`N_3`

C

`N_7`

D

`N_9`

Text Solution

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The correct Answer is:
A,B,C
lone pair of electrons on `N_9` belongs to p orbital, hence involved in delocalization, while the lone pair of electrons on other N lies in `sp^2` orbitals, which being static are available for protonation.
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