Question:
The IUPAC name of the following compound is:
The IUPAC name of the following compound is:
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Always number the ring to give the carbonyl the lowest locant, then assign locants to substituents in alphabetical order if necessary.
Updated On: Jun 19, 2026
- 1-Bromo-2-ethyl cyclohex-1-en-6-one
- 1-Bromo-6-ethyl cyclohex-1-en-2-one
- 2-Bromo-3-ethyl cyclohex-2-en-1-one
- 2-Bromo-1-ethyl cyclohex-1-en-3-one
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The Correct Option is C
Solution and Explanation
Step 1: Identify the parent chain.
The parent ring is cyclohexene with a ketone at position 1.
Step 2: Numbering the ring.
Number the ring such that the carbonyl carbon gets the lowest number (1).
Step 3: Locate substituents.
- Bromine is attached at carbon 2.
- Ethyl group is attached at carbon 3.
Step 4: Combine substituents and parent name.
Hence, the correct name: 2-Bromo-3-ethyl cyclohex-2-en-1-one.
Step 5: Conclusion.
Option (3) is correct.
The parent ring is cyclohexene with a ketone at position 1.
Step 2: Numbering the ring.
Number the ring such that the carbonyl carbon gets the lowest number (1).
Step 3: Locate substituents.
- Bromine is attached at carbon 2.
- Ethyl group is attached at carbon 3.
Step 4: Combine substituents and parent name.
Hence, the correct name: 2-Bromo-3-ethyl cyclohex-2-en-1-one.
Step 5: Conclusion.
Option (3) is correct.
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