Carboxylic acid Nomenclature

when naming a carboxylics acid you need to name it like you would a normal molecule. BUt
 * 1) the suffix is replaced by -ic acid.
 * 2) The Carbon where the double bond O is (C=O) is the start of the carbon chain

a 1 carbon carboxylic acid is a methanoic acid and acetic acid, a 2 carbon carboyxlic acid is a ethanoic acid, a 3 carbon, based on its structure is either propanoic acid, or a iso-propanic acid