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Determine the appropriate resonance from the conjugate base

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3dObject
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Joined: 24 May 2006
Posts: 11

PostPosted: Sun May 28, 2006 5:53 pm    Post subject: Determine the appropriate resonance from the conjugate base Reply with quote

The anwer and explanation to this question is shown to the right of the attached image. I have no problem with the explanations of why choices A, B, and D cannot be the answer.
However I think there may be a typo in the third paragraph and that maybe choice C should be the answer instead of choice E, which has a carbon with 5 bonds, but no plus charge on it. Any advice?




res.png




Last edited by 3dObject on Mon May 29, 2006 1:40 am; edited 1 time in total
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Dan the Chemist
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Joined: 20 May 2006
Posts: 18

PostPosted: Sun May 28, 2006 10:29 pm    Post subject: Reply with quote

This is a typo. None of those are resonance forms of para aminobenzoic acid. The structure of E should have single bonds to both the O- substituents. 5 co-ordinate carbon is (almost) always an absolute no-no because, if it is covalent, this requires 10 valence electrons around carbon.

Correct version attatched




resonance form.gif


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3dObject
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Joined: 24 May 2006
Posts: 11

PostPosted: Mon May 29, 2006 1:43 am    Post subject: Thanks Reply with quote

Thank you.
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