Which of the following are conjugated dienes?
A. 1,2-octadiene
B. 1,3-octadiene
C. 2,5-octadiene
D. 1,7-octadiene
A conjugated diene is a molecule that contains two double bonds with a single bond in between them. Now, we just have to draw each molecule based on the name and figure out whether they have double single double bond pattern.
Answer choice B should be the correct answer.