# Naming compound with multiple carbonyl and/or hydroxyl groups

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

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.

• 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 – MrLuke370 Apr 12 '16 at 17:21
• but hydroxymethanoic acid is also correct – MrLuke370 Apr 12 '16 at 17:28
• @MrLuke370 Yeah, many names are correct. However, I am looking for the IUPAC preferred names. – K.Smith Apr 12 '16 at 17:36
• Why don't you try chemspider to see what options it gives? – MrLuke370 Apr 12 '16 at 17:38
• 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 – MrLuke370 Apr 12 '16 at 18:04

• It's complicated, but generally speaking, $\ce{C-H}$ bonds. – ringo Apr 13 '16 at 4:47