(4 marks) (b) Sketch the 1H and 10B spectra of the tetrahedral anion 10BH4.(10B has I=3) (6 marks) (c) The following data were measured as a function of echo time 2 in a spin echo experiment on the 27Al(I=5/2) resonance of the ion Al(H2O)63+ in aqueous solution: Use a graph to determine the spin-spin relaxation time T2 of the ion. What would be the lower limit on the spin-lattice relaxation time T1 for this species? (12 marks) (d) Explain how a 2D NMR spectrum could be used to distinguish between the carboxylate 13C resonances of glycine (H2NCH2COOH) and alanine (H2NCHCH3COOH) in aqueous solution. Product 2: left - IR Spectrum (gas phase), right - Mass Spectrum (electron impact ionisation) Product 2: IR Spectrum (liquid phase)