Question

What is the correct IUPAC name for the following compound?

• A. trans-3,4-dimethylhex-3-ene
• B. cis-3,4-dimethylhex-3-ene
• C. trans-2,3-dimethylhex-2-ene
• D. cis-2,3-dimethylhex-2-ene

Hint:

Use "cis" or "trans" when the same substituents are present on both ends of a double bond. - Cis: same side
- Trans: opposite sides

Answer 1

The Correct Option is A

Step 1: Identify the longest continuous chain containing the double bond.
The compound contains a total of 6 carbon atoms with a double bond at position 3 → hex-3-ene.
Step 2: Identify the substituents.
There are methyl groups attached to carbon-3 and carbon-4 → 3,4-dimethyl. Step 3: Determine the geometry around the double bond.
The two methyl groups are on opposite sides of the double bond → trans-isomer. \[ \text{Thus, the IUPAC name is: } trans-3,4-dimethylhex-3-ene \]