i want to know that why the hydrogen of second carbon of adenine does not make a hydrogen bond with oxygen of second carbon of thymine .
Hydrogen bridging bonds are only formed by hydrogen in polar functionalities that have the potential to act as proton donors (proton acids) such as -OH or -SH. Hydrogen bonded to C, especially to C in an aromatic ring system does not have the ability to "share" its s-electron between two p orbitals of two different atoms.
Hydrogen bridging bonds are only formed by hydrogen in polar functionalities that have the potential to act as proton donors (proton acids) such as -OH or -SH. Hydrogen bonded to C, especially to C in an aromatic ring system does not have the ability to "share" its s-electron between two p orbitals of two different atoms.
If you are talking about natural DNA molecule, adenine-thymine base pair allow the DNA helix to maintain a regular helical structure, and if the carbonyl oxygen of the second carbon atom in thymine would make interaction with the adenine in every pair of that kind, the DNA couldn't be formed properly, because the deoxyribose unit would be too close to the base pair interactions, which would lead to less conformational freedom. But if you are talking about interaction of those base pairs in solution or in gas phase, why not, it could happen. And now I see that I missed the question, in that case I agree with previous answer.
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