14.19 Suggest a reasonable structure for an unknown compound whose mass spectrum and IR spectrum are shown here. Relative intensity (%) Transmittance (%) 100 80- 60- 40- 20 0T 10 100- 80- 60- 40 SOURCE: NIST, Office of Data ahlu 20- 0 4000 15 20 3500 25 30 3000 SOURCE: NIST, Office of Data and Informati 35 40 m/z 45 50 2500 2000 Wavenumber (cm-1) 55 1500 60 65 1000 70 75 Transmittance (%) SOUR 14.2 ensity (%)