7. Which hydrogens in the following compound will be exchanged most rapidly for deuterium upon reaction with D2O and NaOD? H4 H3 H2 H1 O H5 ((A) H1 ((B) H2 ((C) H3 ((D) H4 ((E) H5

8. The following compound will have a proton NMR spectrum that shows: O CH3 O O CH3 CH3 ((A) two singlets, area ratio 3:1. ((B) two singlets, area ratio 9:1. ((C) three singlets, area ratio 3:3:6. ((D) four singlets, area ratio 3:2:6:1. ((E) six singlets, area ratio 3:3:3:1:1:1.