In which of the following cases does the suggested name not follow the IUPAC system of nomenclature?

Options

A. `{:(" "CH_(3)" "CH_(2)CH_(3)),(" | |"),(CH_(3)-CH-CH-CH_(3)),(" 2,3-dimethylpentane"):}`
B. `underset("4-methylpent-2-yne")(CH_(3)-C-=C-CH(CH_(3))_(2))`
C. `{:(CH_(3)-CH-CO-CH_(3)),(" |"),(" "CH_(3)),(" 2-methyl-3-butanone"):}`
D. `{:(CH_(3)-CH-CH-COOH),(" | |"),(" "CH_(3)" "CH_(3)),(" 2,3-dime thyl butanoic acid"):}`

Answer

C

Explanation

`underset("3-methyl-2-butanone")(overset(4)(CH_(3))-undersetunderset(CH_(3))(|)overset(3)(CH)-overset(2)(CO)overset(1)CH_(3))`