Question

What is the name of isopropyl alcohol according to carbinol system?

• A. Methyl carbinol
• B. Dimethyl carbinol
• C. Ethyl carbinol
• D. Propyl carbinol

Hint:

Carbinol naming: Count groups attached to C–OH 2 methyl $\rightarrow$ Dimethyl carbinol

Answer 1

The Correct Option is B

Concept: In carbinol system, alcohols are named based on groups attached to the carbon bearing OH group.

Step 1: Structure of isopropyl alcohol. \[ \text{CH}_3 - \text{CHOH} - \text{CH}_3 \]

Step 2: Identify groups attached to OH carbon.
• Two methyl groups attached

Step 3: Apply naming rule.
Two methyl groups $\rightarrow$ Dimethyl carbinol

Step 4: Conclusion.
Thus, isopropyl alcohol is dimethyl carbinol. Final Answer: Option (B)