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7. (10, 2 each) From the following list of compounds, circle those which would be expected to exhibit aromaticity according to the Hckel rules. You may assume that all will be planar or nearly so. \begin{tabular}{|l|l|c|} \hline \multicolumn{2}{|c|}{ Characteristic Proton Chemical Shifts } \\ \multicolumn{2}{|c|}{ Chemical shift } \\ Type of Proton \end{tabular} 13 C. NMR Chemical Shift Correlations = proton exchanges with D2O