What will be the IUPAC name of the following compound?

3,7,7- Trimethylhepta-2,6-dienal 2,6-Dimethylocta-2,6-dienal 3,7-Dimethylocta-2,6-dienal 2,6-Dimethylhepta-1,5-dien-1-al

3,7-Dimethylocta-2,6-dienal

The correct answer is option 3. 3,7-Dimethylocta-2,6-dienal. The longest straight chain is marked by arrow Now, number the carbon atoms on the basis of priority: Thus, alphabetically naming the compound we get: