According to IUPAC system, the compound
- Cyclohex-1-en-2-ol
- 1-Hydroxyhex-2-ene
- Cyclohex-1-en-3-ol
- Cyclohex-2-en-1-ol
The Correct Option is D
Approach Solution - 1
The compound shown in the image is a substituted cyclohexane. To name it according to the IUPAC system, follow these steps:
- Identify the longest carbon chain that includes the highest priority functional group, which in this case is the hydroxyl group (-OH).
- Number the carbon atoms in the ring starting from the carbon to which the -OH group is attached and moving in the direction that gives the double bond the lowest possible number. Here, the -OH group gets priority due to its higher precedence over the alkene.
- Assign numbers:
- The hydroxyl group (-OH) is attached to carbon 1.
- The double bond starts at carbon 2.
- Combine the information to form the name:
- The name will include "cyclohex" due to the six-carbon ring.
- Use "en" to denote the double bond starting at carbon 2.
- Use "ol" to indicate the presence of the hydroxyl group at carbon 1.
Therefore, the correct IUPAC name for the compound is Cyclohex-2-en-1-ol.
Let's rule out the other options:
- Cyclohex-1-en-2-ol: Incorrect numbering, as the double bond should be at carbon 2.
- 1-Hydroxyhex-2-ene: This suggests an open chain structure, not a cyclic one.
- Cyclohex-1-en-3-ol: Incorrect numbering for the placement of -OH and the double bond.
Hence, the correct answer is Cyclohex-2-en-1-ol.
Approach Solution -2
The compound has a hydroxyl group (-OH) attached to the first carbon in the cyclohexene
ring, and the double bond is at the second carbon. According to IUPAC nomenclature: -
The base name ”Cyclohex” comes from the cyclohexane ring. - The double bond is between
positions 2 and 3, so we have ”Cyclohex-2-en”. - The hydroxyl group is at position 1, so the
name ends with ”1-ol”.
Thus, the correct IUPAC name is ”Cyclohex-2-en-1-ol”.
The Correct Answer is: Cyclohex-2-en-1-ol
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