Question

The IUPAC name of the following compound is :

• A. 2-Methyl-3Hydroxypentan-5-oic acid
• B. 4,4-Dimethyl-3-hydroxy butanoic acid
• C. 3-Hydroxy-4 -methylpentanoic acid
• D. 4-Methyl-3-hydroxypentanoic acid

Answer 1

The Correct Option is C

The correct option is(C): 3-Hydroxy-4 -methylpentanoic acid

The given compound is a carboxylic acid with a hydroxy group and a methyl group attached to its carbon chain. To determine its IUPAC name, let's break down the structure and identify the substituents:

1. The main carbon chain contains five carbons, so it's a pentanoic acid.
2. There is a hydroxy group (-OH) attached to the third carbon. This is indicated by the prefix "hydroxy" and the position number "3."
3. There is a methyl group (-CH3) attached to the fourth carbon. This is indicated by the prefix "methyl" and the position number "4."

Putting it all together, the IUPAC name of the compound is "3-Hydroxy-4-methylpentanoic acid."

Justification:

• "3" indicates the position of the hydroxy group.
• "Hydroxy" indicates the presence of the hydroxy group.
• "4" indicates the position of the methyl group.
• "Methyl" indicates the presence of the methyl group.
• "Pentanoic acid" indicates the main carbon chain and the carboxylic acid functional group.