1. Which of the following structures is 2-methylpentane? (A) CH3CH2CH2CH2CH3 (B) CH3CHCH2CH2CH3 CH3 (C) CH3 CH3CCH3 CH3 (D) (E) CH3CH2CHCH3 CH3

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.