Which of these conjugated dienes can undergo a Diels-Alder reaction?
A)I
B)II
C)III
D)IV

Question

Which of these conjugated dienes can undergo a Diels-Alder reaction? 
A)I 
B)II 
C)III 
D)IV

Quizplus · Accepted Answer

III is a conjugated diene because it has a alternating single and double bonds. Furthermore, it has two pi bonds that are in the same plane and can participate in a Diels-Alder reaction, allowing it to act as dienophile. I, II, IV, and V do not have the correct arrangement of pi bond for Diels-Alder reaction to occur.

Which of These Conjugated Dienes Can Undergo a Diels-Alder Reaction