Question

IUPAC name of the following compound:

• A. 3,4-dimethylpentanol
• B. 2,3-dimethyl-5-pentanol
• C. 2,3-dimethylpentanol
• D. 3,4-dimethyl-1-pentanol

Hint:

For naming alcohols, first find the longest carbon chain, number it to give the hydroxyl group the lowest possible number, and then add names for any substituents.

Answer 1

The Correct Option is A

Step 1: Identify the longest carbon chain that includes the hydroxyl group (-OH).
- The longest continuous chain that includes the -OH group has five carbon atoms, so the parent chain is pentane.

Step 2: Number the carbon chain from the end closest to the -OH group.
- This ensures the -OH group gets the lowest possible number.
- The hydroxyl group is on carbon 1, so it is named as 1-pentanol.

Step 3: Identify and number substituents on the chain.
- Two methyl groups are attached at carbon atoms 3 and 4 of the main chain.

Step 4: Combine the names of substituents, parent chain, and position of -OH.
- Name = 3,4-dimethyl-1-pentanol

Final Answer: 3,4-dimethyl-1-pentanol