Answer
It is a Carboxylic acid, 3-methylpentanoic acid
Work Step by Step
These structures for carboxylic acids are named according to the nomenclature system rules set by the IUPAC.
1. The longest hydrocarbon chain has 5 carbon atoms, thus it is a pentanoic acid.
2. The numbering starts from the carbon atom containing the carboxylic acid functional group.
3. The methyl group is found on carbon number 3.