In which case does an unshared pair of electrons NOT contribute to the $\pi$ aromatic system?

Name: In which case does an unshared pair of electrons NOT contribute to the $\pi$ aromatic system?
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Question

Quizplus · Accepted Answer

In scenario II, the unshared pair of electrons is located on the nitrogen atom, which is not part of the F1F1F1S1F1F1F10 aromatic system. Therefore, it does not contribute to the system. In all other scenarios, the unshared pair of electrons either participates in resonance or is part of the aromatic system.

In Which Case Does an Unshared Pair of Electrons NOT π\piπ

In Which Case Does an Unshared Pair of Electrons NOT $\pi$