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

The structure shows a cyclopentane ring with an ethyl group attached at position 4.
The double bond is present between positions 2 and 3.
The hydroxyl group (\( -OH \)) is attached at position 1.
Following IUPAC naming rules:
The ring is numbered to give the lowest possible number to the double bond.
The ethyl group is placed at position 4.
The hydroxyl group takes priority in numbering, so it is placed at position 1.
Thus, the correct IUPAC name is 4-ethylcyclopent-2-en-1-ol.