Final answer:
The compound 4-propyl-3-octene has a total of eleven carbon atoms, which includes eight from the main octene chain and three from the propyl group attached to it. The correct answer is option D).
Step-by-step explanation:
The compound named 4-propyl-3-octene indicates that the base hydrocarbon chain consists of eight carbon atoms (oct- indicates an eight-carbon alkene chain). The number 3 in front of octene indicates the position of the double bond, meaning the double bond is between the third and fourth carbons in the main chain. The prefix 4-propyl- indicates that there is a propyl group attached to the fourth carbon of the main chain. A propyl group consists of three carbon atoms.
So to determine the total number of carbon atoms in the compound, we add the eight-carbon main chain to the three additional carbons from the propyl group, which gives us a total of eleven carbon atoms (8 main chain + 3 propyl group = 11).