Question

The correct IUPAC name of the compound is:

• A. 4-ethylcyclopent-2-en-1-ol
• B. 3-ethylcyclopent-4-en-1-ol
• C. 5-ethylcyclopent-1-en-3-ol
• D. 3-ethylcyclopent-1-en-5-ol

Hint:

When naming compounds with multiple substituents, number the ring in a way that minimizes the locants of the functional groups.

Answer 1

The Correct Option is A

A cyclopentane ring features an ethyl group at position 4. A double bond exists between positions 2 and 3. A hydroxyl group ( \( -OH \) ) is attached at position 1.
Adhering to IUPAC nomenclature:
Numbering prioritizes the double bond with the lowest possible locant.
The ethyl substituent is located at position 4.
The hydroxyl group dictates the numbering priority, thus residing at position 1.
Consequently, the IUPAC name is 4-ethylcyclopent-2-en-1-ol.