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I think I understood the main idea behind naming compounds with carbonyl groups, however I am not sure about a few things.

Compounds

For the first compound, there is more than one carbonyl group and one of them is in the end of the chain. I am trying to decide between 2-oxopropanal and propana-1,2-dione.

For the second one, I am not sure what happens if there are two oxygens attached to a carbon atom with a double bond. I am trying to decide between methanedione and methanedial.

I am not sure about this because one definition of aldehydes I have heard is when the carbon atom is attached to a hydrogen as well as the oxygen. And the other is if it is in the end of the chain.

And the final compound that I am not sure about is when there are two hydroxyl groups attached to the carbon as well as an oxygen with a double bond. I think it is hydroxymethanoic acid, but I am not completely sure.

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    $\begingroup$ The second compound is carbon dioxide anyway, the first one is 2-oxopropanal because it doesn't have 2 ketones and number 3 is carbonic acid $\endgroup$ – MrLuke370 Apr 12 '16 at 17:21
  • $\begingroup$ but hydroxymethanoic acid is also correct $\endgroup$ – MrLuke370 Apr 12 '16 at 17:28
  • $\begingroup$ @MrLuke370 Yeah, many names are correct. However, I am looking for the IUPAC preferred names. $\endgroup$ – K.Smith Apr 12 '16 at 17:36
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    $\begingroup$ Why don't you try chemspider to see what options it gives? $\endgroup$ – MrLuke370 Apr 12 '16 at 17:38
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    $\begingroup$ In the name sectionin light grey it says IUPAC beside the correct names, and I also put those compounds through chemdraw and it gave the names in my first comment, and as far as i know chemdraw gives IUPAC names .However I could stand to be corrected on that last point $\endgroup$ – MrLuke370 Apr 12 '16 at 18:04
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Carbon dioxide and carbonic acid are inorganic compounds, and therefore would not be named using the IUPAC nomenclature for organic compounds.

The other compound is named 2-oxopropanal, because aldehydes have higher priority than ketones by IUPAC rules.

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  • $\begingroup$ And why are they considered inorganic when they contain carbon in its excited state? What are the criteria for deciding if a compound is organic or not? $\endgroup$ – K.Smith Apr 13 '16 at 4:37
  • $\begingroup$ It's complicated, but generally speaking, $\ce{C-H}$ bonds. $\endgroup$ – ringo Apr 13 '16 at 4:47
  • $\begingroup$ What is "carbon in its excited state"... there is no such thing. $\endgroup$ – orthocresol Apr 13 '16 at 16:59

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