Which of the following structures (a-d) is another resonance structure of the following organic molecule?

Question

Quizplus · Accepted Answer

Resonance structures are different forms of a molecule or ion that can be drawn by redistributing electrons. The given organic molecule has a double bond between the two carbon atoms, and since the carbon atoms are sp2 hybridized, they can form a pi bond. The given molecule already has one pi bond, which means there's another possible location where a pi bond could exist. By moving the pi bond between the two carbon atoms to the neighboring carbon-carbon bond, we can draw the resonance structure shown in choice B. This structure has a delocalized pi electron system, which is more stable than the localized pi electron system of the given molecule. Therefore, B is the best choice for a resonance structure.

Which of the Following Structures (A-D) Is Another Resonance Structure