Question

The IUPAC name of the compound \[ CH_3-CH(CH_3)-CH_2-OH \] is:

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

Hint:

While naming alcohols:
• Give lowest number to \(-OH\) group.
• Select longest chain containing the functional group.

Answer 1

The Correct Option is B

Concept: In IUPAC nomenclature:
• Longest carbon chain containing functional group is selected.
• Alcohol group gets lowest possible number.
• Alkyl substituents are named with their positions.

Step 1: Identify longest carbon chain.
Given structure: \[ CH_3-CH(CH_3)-CH_2-OH \] The longest continuous chain contains: \[ 3 \text{ carbon atoms} \] Hence parent chain is: \[ \text{propane} \]

Step 2: Locate alcohol group.
The: \[ -OH \] group is attached to carbon number \(1\). Thus: \[ \text{propan-1-ol} \]

Step 3: Identify substituent.
There is one methyl group attached to carbon number \(2\). Hence the complete name becomes: \[ 2\text{-Methylpropan-1-ol} \] Therefore, the correct answer is: \[ \boxed{\text{(B) 2-Methylpropan-1-ol}} \]