Question

The IUPAC name for the following compound is:

• A. $2,5$-dimethyl-$5$-carboxy-hex-$3$-enal
• B. $2,5$-dimethyl-$6$-oxo-hex-$3$-enoic acid
• C. $6$-formyl-$2$-methyl-hex-$3$-enoic acid
• D. $2,5$-dimethyl-$6$-carboxy-hex-$3$-enal

Answer 1

The correct option is B

$2,5$-dimethyl-$6$-oxo-hex-$3$-enoic acid

The appropriate choices are (b)

The explanation for the correct answers is:

(b)

• Methanoic anhydride is the IUPAC name for the substance given. It is a formic acid or methanoic acid anhydride.
• The parent is heptane because the longest carbon chain contains six oxo-hexanes.
• If they are given first dibs on a name, they receive the suffix "al" or "carbaldehyde."
• The prefixes "oxo" and "formyl" are used as substitutes. In recommended IUPAC names, the prefix "formyl" is utilised with the exception of a -CHO group at the end of an acyclic chain.
• Diagram:

The correct answer is (b): The parent is heptane because the longest carbon chain contains six oxo-hexagons.