GENERAL ORGANIC CHEMISTRY
231860
The IUPAC name of the molecule
is
1 4-oxo-2,3-dimethylpent-2-en-1-oic acid
2 2-carboxy-3-methylpent-2-en-3-one
3 4-carboxy-3-methylpent-3-en-2-one
4 2,3-dimethyl-4-oxo-pent-2-en-1-oic acid
Explanation:
The IUPAC name of molecule is -

4-oxo-2,3-dimethylpent-2-en-1-oic acid