Is either of the following ions aromatic? Is either antiaromatic?Sample Solution (a) The c...

Is either of the following ions aromatic? Is either antiaromatic?

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.