To determine the correct structure of 2,6-Dimethyl-dec-4-ene, we need to follow these steps:$\\$1. Identify the parent chain:$\\$• The parent chain is "dec-4-ene," which means a 10-carbon chain with a double bond starting at the 4th carbon.$\\$2. Number the carbon atoms:$\\$• Start numbering from the end closest to the double bond to give it the lowest possible number.$\\$• The double bond is between the 4th and 5th carbon atoms.$\\$3. Add the substituents:$\\$• "2,6-Dimethyl" indicates two methyl groups attached to the 2nd and 6th carbon atoms.$\\$4. Analyze the options:$\\$• Option 1: The structure shows a 10-carbon chain with a double bond between the 4th and 5th carbons, and methyl groups on the 2nd and 6th carbons.$\\$• Option 2: The double bond is incorrectly placed.$\\$• Option 3: The double bond is incorrectly placed.$\\$• Option 4: The double bond is incorrectly placed.$\\$Therefore, the correct structure is represented by Option 1.