please offer explanations. thank you

Problem 1 (45 pts) Circle the best answer to each question. a) Circle the diene that would be unreactive In a Diels-Alder Reaction. b) Clrcle the triene that would absorb light at the longest wavelength? c) Circle the compound that is an example of an Isolated diene. d) Circle the compound that would have shortest max? e) Circle the compound with a [M+2]+peak intensity nearly equal to the intensity of the molecular ion peak