6.21

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Joanne Kang 3I
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Joined: Thu Jul 25, 2019 12:17 am

6.21

Postby Joanne Kang 3I » Thu Dec 05, 2019 4:42 pm

The two strands of the nucleic acid DNA are held together by hydrogen bonding between four organic bases. The structure of
one of these bases, thymine, is shown below. (a) How many protons can this base accept?
Why can't the Oxygen molecules be proton acceptors as well? They have lone pairs
Image
Thanks!

Chem_Mod
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Re: 6.21

Postby Chem_Mod » Thu Dec 05, 2019 6:16 pm

It's a matter of stability because if Oxygen accepted the proton, it would have a positive formal charge. This is more unstable because oxygen is more electronegative than Nitrogen. The positive formal charge would be better on the Nitrogen instead, even though both have lone pairs.


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