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5. (12, 4 each) Below are shown two Diels-Alder reactions. In each, either the product or one or both starting materials has been replaced by a box. In each box, draw the structure of the compound that correctly completes the equation. heat heat 6. (12, 4 each) Give the correct IUPAC names for the compounds having each of the following structures. Be sure to use the terms ortho, meta, and para when appropriate. a. b. c. \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