Explain the following a. the cycloheptatrienyl anion is, Ask an Expert

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Question about Aromatic Compounds
Explain the following: a.) The cycloheptatrienyl anion is antiaromatic, whereas the cyclononatetraenyl anion is planar (in spite of the angle stain involved) and appears to be aromatic. b.) Although 16 annulene is not aromatic, it adds two electrons readily to form an aromatic dianion.

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