Question

IUPAC names of mesityl oxide and oxalic acid are respectively:

• A. 4-Methylpent-3-en-2-one; Ethanedioic acid
• B. 4-Methylpent-3-en-2-one; Propanedioic acid
• C. 3-Methylpent-3-en-2-one; Propanedioic acid
• D. 3-Methylpent-3-en-2-one; Ethanedioic acid

Hint:

For organic compounds, prioritize functional groups and longest chains in IUPAC nomenclature.

Answer 1

The Correct Option is A

Step 1: Naming Mesityl Oxide Mesityl oxide has the structure: \[ \text{CH}_3-\text{CH}_2-\text{C}(\text{CH}_3)=\text{CH}-\text{COCH}_3 \] Using IUPAC rules: - The longest chain includes the ketone and double bond. - Numbering starts from the end nearest to the functional group. - Methyl group at carbon-4 → 4-Methylpent-3-en-2-one. Step 2: Naming Oxalic Acid Oxalic acid is: \[ \text{HOOC-COOH} \] Its IUPAC name is Ethanedioic acid. Conclusion Thus, the correct answer is: \[ 4\text{-Methylpent-3-en-2-one}; \text{Ethanedioic acid} \]