Question

The correct IUPAC nomenclature for the following compound is.

• A. 2 Methyl 5 oxohexanoic acid
• B. 2 Formyl 5 methylhexan 6 oic acid
• C. 5 Formyl 2 methylhexanoic acid
• D. 5 Methyl 2 oxohexan 6 oic acid

Answer 1

The Correct Option is A

To name the compound correctly, we follow IUPAC nomenclature rules. 
1. Identify the parent chain. The longest continuous chain containing the carboxylic acid group is chosen. In this case, the parent chain has six carbon atoms, so the base name is 6 hexanoic acid. 
2. Number the chain. Number the chain starting from the carboxylic acid group, giving it the lowest possible number. The carboxylic acid group is at position 1. 
3. Identify substituents and functional groups. There is a keto group at position 5, named as oxo. There is a methyl group attached to position 2. 
4. Combine the names. Combine the substituent positions, names, and parent chain name. The correct name is 2 Methyl 5 oxohexanoic acid.

Analysis of options. 
Option (1). Correct. Matches the IUPAC rules. 
Option (2). Incorrect. The naming improperly places formyl instead of oxo for the keto group. 
Option (3). Incorrect. The substituent positions and functional groups are misplaced. 
Option (4). Incorrect. The positions of oxo and methyl groups are incorrect. 
Thus, the correct answer is option (1) .