The `IUPAC` name of is

Options

A. (1) `4`-methyl-`5`-oxopentanoic acid
B. (2) `2`-formylpentanoic acid
C. (3) `4`-carboxy-`2`-methylbutanal
D. (4) `4`-formylpentanoic acid

Answer

A

Explanation

The compound contains an acid function as well as an aldehyde function. It is named as an alkanoic acid as the `-COOH` group gets precedence over the `-CHO` group. For the `-CHO` function, we use the prefix formly if it is not at the terminal. For the terminal position, prefix `-o x o` is used.
`HO-overset(O)overset(||)(C)overset(1)-overset(2)(CH_(2))-overset(3)(CH_(2))-underset(CH_(3))underset(|)overset(4)(CH)-overset(5)(CHO)`