Which one of the following dienes is most stable?
A) I
B) II
C) III
D) IV

Question

Which one of the following dienes is most stable? 
A) I 
B) II 
C) III 
D) IV

Quizplus · Accepted Answer

The stability of dienes is related to their ability to delocalize electrons across the molecule. The conjugated diene, III, has a continuous overlap of p orbitals along the molecule, which allows for efficient delocalization of electrons and thus greater stability. The other dienes have fewer p orbitals contributing to electron delocalization, making them less stable.

Which One of the Following Dienes Is Most Stable