What is the IUPAC name for CH3-CH(NH2)-COOH?

The correct answer, 2-Amino propanoic acid, is derived from the structure of the compound CH3-CH(NH2)-COOH. This molecule contains a three-carbon chain (propanoic acid) with an amino group (-NH2) attached to the second carbon.

In IUPAC nomenclature, when naming a molecule with both a carboxylic acid functional group and an amino group, the priority is given to the carboxylic acid which indicates the suffix "-oic acid". The carbon chain is numbered starting from the end nearest to the carboxyl group. In this case, the first carbon is part of the carboxylic acid group (COOH), making it carbon 1. The amino group on the second carbon is indicated by the "2-Amino" prefix.

Therefore, this leads to the full name of the compound as 2-Amino propanoic acid. This name accurately reflects both the presence of the carboxylic acid and the amino group, as well as their respective positions on the carbon chain.

The other choices do not correctly describe the structure provided. Amino butanoic acid would suggest a four-carbon chain, which doesn't correspond to the molecule