Easy
In the following resonance structures,the curved arrow indicates that electrons are shifted from:
- AAtom to adjacent bond in both $(A)$ and $(B)$.
- B$\pi$ bond to adjacent atom in both $(A)$ and $(B)$.
- C$\pi$ bond to adjacent atom in $(A)$ and atom to adjacent bond in $(B)$.
- DAtom to adjacent bond in $(A)$ and $\pi$ bond to adjacent atom in $(B)$.
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