Answer:
4-ethyl-6-methyl-3-heptene
Explanation:
Longest chain is seven long so it is heptane
But there is a double bond, so that becomes heptene
The double bound starts on the third carbon, so it is 3-heptene (this tells us where the double bond is)
Now we just got to do the substituents!
There is a ethyl group of the fourth carbon and then a methyl group on the sixth!
Ergo, 4-ethyl-6-methyl-3-heptene
