3. a. Compound B is either of the structures (1 or 2) shown below CH3 NO2 O2N (i) Discuss whether the mass spectrometry data shown in Figure 1 can aid in the determination of compound B. MASS SPECTRUM 100 92 137 80 60 Ral Intensity 40 20 00 0.0 40 120 80 m/2 160 Figure 1 (11) Define the terms fragment ion and molecular ion as used in mass spectrometry. 14 (111) Assign structures to the labelled signals in Figure 1 and state whether each of your assignments is a fragment ion or a molecular ion, [o