1aa3-2010-tut7 - CHEMISTRY 1AA3 March 1-5, 2010 TUTORIAL...

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CHEMISTRY 1AA3 March 1-5, 2010 TUTORIAL PROBLEM SET 7 ________________________________________________________________________ Chemistry 1AA3 1. Indicate whether or not you would expect the following molecules to be aromatic and indicate the total number of π -electrons present in each compound. 2. It is possible to create cyclic carbocations and carbanions that are aromatic. If an ionic species has alternating single and double bonds and fits Hückel's rule, it will likely be aromatic and therefore much more stable than non-aromatic ionic species. Cyclic systems containing alternating single and double bonds that do not follow the Hückel rule are typically very reactive (often called antiaromatic because they are less stable than their open chain counterparts). Indicate which of the following ions would be expected to be favourably formed (particularly if their precursors are not aromatic). 3.
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1aa3-2010-tut7 - CHEMISTRY 1AA3 March 1-5, 2010 TUTORIAL...

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