Benzene - 1 - 2 dicarboxlyic acid?

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Batman2k1
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#1
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#1
If there are 2 COOH groups next to each other, bonded to a benzene ring.

Why is it dicarboxylic acid?
My thought was dimethanoic acid instead.
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lelak1
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#2
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does this mean that the 2 cooh groups are both bonded to the same carbon of the benzene ring? - because im pretty sure that cant happen
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lloydmynumber
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#3
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(Original post by eshakaur11)
does this mean that the 2 cooh groups are both bonded to the same carbon of the benzene ring? - because im pretty sure that cant happen
i agree
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theogwhiz
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#4
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(Original post by Batman2k1)
If there are 2 COOH groups next to each other, bonded to a benzene ring.

Why is it dicarboxylic acid?
My thought was dimethanoic acid instead.
I'm guessing you mean each -COOH bonded to a different carbon (eg. C1, C2)?

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I would have thought for A-Level spec, nomenclature would be 1,2-benzendicarboxylic acid?
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Batman2k1
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#5
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(Original post by eshakaur11)
does this mean that the 2 cooh groups are both bonded to the same carbon of the benzene ring? - because im pretty sure that cant happen
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Batman2k1
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#6
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(Original post by theogwhiz)
I'm guessing you mean each -COOH bonded to a different carbon (eg. C1, C2)?

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I would have thought for A-Level spec, nomenclature would be 1,2-benzendicarboxylic acid?
Yep thats the diagram

Apparently the answer is
benzene - 1,2-dicarboxylic acid
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lloydmynumber
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#7
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yep thats because you start off with the smaller number coz benzene - 2,3-dicarboxylic acid is the same as benzene -1,2-dicarboxylic acid
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Batman2k1
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#8
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#8
(Original post by lloydmynumber)
yep thats because you start off with the smaller number coz benzene - 2,3-dicarboxylic acid is the same as benzene -1,2-dicarboxylic acid
No, i'm not confused about the number locant of a carbon.

Why is it dicarboxylic acid? Why not methanoic acid, if you get where im coming from?
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lelak1
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#9
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#9
(Original post by Batman2k1)
No, i'm not confused about the number locant of a carbon.

Why is it dicarboxylic acid? Why not methanoic acid, if you get where im coming from?
because the main 'functional group' is the benzene ring, to which there are 2 COOH groups bonded to it
does that help or not?
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Batman2k1
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#10
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#10
Thanks, yes.
Not sure why benzene is the main functional group? It has a higher priority in nomenclature?
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leafy9
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#11
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#11
Carboxylic acid is still the higher priority group. Which is why it's at the end of the name. But they are both connected to a benzene ring. So no -yl fragment naming is needed.
Benzene-1,2-dicarboxylic acid.
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