Question

What is IUPAC name of following compound?

• A. 3 - Methyl - 6 - ethyl cycloheptanol
• B. 3 - Ethylcyclooctanol
• C. 3 - Ethyl - 6 - methylcycloheptanol
• D. 1 - Ethyl - 5 - methylcycloheptan - 3 - ol

Hint:

Number from the carbon with OH, then give the substituents the lowest locants, alphabetical order breaks ties.

Answer 1

The Correct Option is C

Step 1: Read the structure
Seven ring carbons, one OH, one CH$_3$ and one C$_2$H$_5$ group.

Step 2: Number
OH carbon = 1. Going one way gives substituents at 3 and 6; going the other way also gives 3 and 6. A tie, so alphabetical order decides: ethyl gets 3.
Name: 3-ethyl-6-methylcycloheptanol, which is option (C).

Final Answer:
The IUPAC name is 3-ethyl-6-methylcycloheptanol, option (C). \[ \boxed{\text{3-Ethyl-6-methylcycloheptanol}} \]