Which species is represented by the following distribution of π electrons in the molecular orbitals and energy levels diagram?
A)I
B)II
C)III
D)IV

Question

Which species is represented by the following distribution of π electrons in the molecular orbitals and energy levels diagram?  
A)I 
B)II 
C)III 
D)IV

Quizplus · Accepted Answer

The species represented in the diagram has 10 π electrons in total. Looking at the diagram, we can see that there are two sets of degenerate orbitals. One set contains 4 π electrons and the other set contains 6 π electrons. This suggests that the species has two double bonds and one lone pair of electrons. The only option that fits this description is choice C), which represents an allyl anion.

Which Species Is Represented by the Following Distribution of π