" please explain which IUPAC name is correct and by which IUPAC rules. As far as I know , they both seems tofollowing names seem to be correct for the compound below. "Please explain which IUPAC name is correct by which IUPAC rules:
- 4-formylpentanoic acid (methyl group counted in the main chain);
- 4-methyl-5-oxopentanoic acid (aldehyde group counted in the main chain).