The first molecule is a three-carbon chain with two carboxylic acid functional groups attached to the first and second carbon atoms. The second molecule is a two-carbon chain with a chlorine atom attached to the first carbon atom. Using the IUPAC naming system, the name of the first molecule is "propanedioic acid" or "malonic acid" and the name of the second molecule is "1-chloro-2-methylpropane". Therefore, the answer is 1-chloro-2-methylpropane.