Naming Carboxylic Acids

  1. All carboxylic acid names end with the suffix 'oic'. For example, methanoic acid, ethanoic acid, propanoic acid and butanoic acid.
  2. The carboxylic acid is named by replace the ending “ane” from the name of alkane with “anoic acid”.
  3. Unlike alcohol, the position of the functional group (the carboxyl group) need not be stated in the name of carboxylic acid.
Number of Carbon Name of Alkane Name of Carboxylic Acid
1 methane methanoic acid
2 ethane ethanoic acid
3 propane propanoic acid
4 butane butanoic acid
5 pentane pentanoic acid
6 hexane hexanoic acid


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