Question

What is the IUPAC name of CH$_3$CH(OH)CH$_3$?

• A. Propan-1-ol
• B. Propan-2-ol
• C. Ethanol
• D. Butan-2-ol

Hint:

Number the carbon chain to give the functional group the lowest possible number in IUPAC naming.

Answer 1

The Correct Option is B

Step 1: Identify the structure. The compound is CH$_3$CH(OH)CH$_3$, an alcohol with -OH group. 
Step 2: Count carbons: 
- Total 3 carbons: CH$_3$-CH-CH$_3$ (OH on middle carbon). 
Step 3: Name the parent chain: 3 carbons = propane. The -OH group is on the 2nd carbon, so it's propan-2-ol. 
Step 4: Verify: 
- Propan-1-ol: OH on 1st carbon. 
- Ethanol: 2 carbons. 
- Butan-2-ol: 4 carbons. 
Matches option (2).