What is the correct IUPAC name of the following compound?
What is the correct IUPAC name of the following compound?
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- 4-Ethyl-1-hydroxycyclopent-2-ene
- 1-Ethyl-3-hydroxycyclopent-2-ene
- 1-Ethylcyclopent-2-en-3-ol
- 4-Ethylcyclopent-2-en-1-ol
The Correct Option is D
Approach Solution - 1
To determine the correct IUPAC name of the given compound, we will follow these steps:
- Identify the Longest Carbon Chain: The given structure is a cyclopentene ring with a double bond and two substituents: an ethyl group and a hydroxyl group.
- Number the Carbon Atoms: Start numbering the ring such that the substituents and functional groups get the lowest possible numbers. Priority is given to the functional group (hydroxyl group -OH) over the double bond.
- Assigning Numbers:
- The hydroxyl group is located on carbon 1 to give it the lowest possible number.
- The double bond starts from carbon 2.
- The ethyl group is located on carbon 4.
- Form the Name: Combine the names of the substituents and the main chain.
- The base name for the five-membered ring with a double bond is "cyclopentene."
- The presence of an -OH group changes it to "cyclopentenol."
- The ethyl group is at position 4, and the -OH group is at position 1, resulting in the name "4-Ethylcyclopent-2-en-1-ol."
This IUPAC name correctly follows the rules for priority and numbering on a cyclohexene structure with substituents.
Therefore, the correct IUPAC name of the compound is 4-Ethylcyclopent-2-en-1-ol.
Approach Solution -2
Step 1: Identify the parent chain and the functional group.
- The parent structure is a cyclopentene ring, which is a five-membered ring with one double bond.
- The double bond is at position 2, as the numbering starts from the carbon atom of the double bond.
- The hydroxyl group (-OH) is attached at position 1 of the ring.
Step 2: Name the substituents.
- An ethyl group (-C2H5) is attached at position 4 of the ring.
- The hydroxyl group is at position 1, so it is named as "1-ol."
Step 3: Final IUPAC name.
The correct IUPAC name of the compound is:
4-Ethylcyclopent-2-en-1-ol
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