Is either of the following ions aromatic? Is either antiaromatic?
(a)
(b)
Sample Solution (a) The crucial point is the number of π electrons in a cyclic conjugated system. If there are (4n + 2) π electrons, the ion is aromatic. Electron counting is easiest if we write the ion as a single Lewis structure and remember that each double bond contributes two π electrons, a negatively charged carbon contributes two, and a positively charged carbon contributes none.
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