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Whenever an atom possesses both a π bond and a lone pair, they will not both participate in resonance The sentence means that only one, either the 𝜋 bond or the lone pair will participate in resonance if the atom has both. For example, in a pyridine, the nitrogen has a lone pair and it is also attached to a 𝜋 bond. Here, however, only the 𝜋 bond ...

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