a. The mass spectrum below comes from one of the following compounds. Which is it? 57 100- A. CH,CH,CH,Br . CH,CH,CH,CH,CI 41 OC. CH,CH,CH,CH,Br 29 50- D. CH,CH,CH,OH 39 15 43 79 93 107 136 50 10 20 30 40 50 60 70 80 90 100 110 120 130 140 1 50 b. 2-Bromo-2-methylpropane has a major peak in the mass spectrum at m/z 57. This peak corresponds to OA. CH . H,c-CH, Br Oc. CH3 H,C-C H, D. CH, H,C-C-Br H,