2. Provide the structures of the 1,2 - and 1,4-addition products obtained from the following reaction. Make sure to label which is 1,2- and which is 1,4-, which is the kinetic and which is the thermodynamic product. 3. Draw two resonance structures of the reactive intermediate that accounts for the formation of 1,2- and 1,4-addition products upon reaction of 1,3-butadiene with one equivalent of bromine. 4.Write the structures for the two starting materials (diene and dienophile) that lead to the formation of the following Diels-Alder product. ? Diene + ? Dienophile 5. Which of 1,3-cyclohexadiene and 1,4-cyclohexadiene has the greatest heat of hydrogenation (i.e., the most exothermic reaction with H2 in the presence of a catalyst). Provide a brief explanation for your choice. 6. What is the major organic product obtained from the following reaction