Question

Lab 8: Instrumental Analysis You are given seven unknowns, all of which are white or brown powders. Use the provided IR and 1H NMR spectra to assign Unknowns 1-7 to the given compounds. Label all spectra and briefly explain how you made your determinations. NH ОН OR foncommon - 0 o-vanillin Benzoic acid p-toluidine 4-tert-butylphenol OH Y OH H2NY COH salicylic acid 9-fluorenol 4-aminobenzoic acid

Answer 1

Amsweg Yoyo-yomillin af H NMR 173.8 8 34 singlet CH3-0 methyl group may be attached oxygeot to ] 7 to 7.3d 34 mulnplet au are avomatic prorons 4 couple' to each other & show muctiplet 3) 7.90 LH singlet - o-l group & alcohol group present 4 10.28 th single! - aidehyde goout popjey) - NMR 1 3100-3200 con d ont groun present 27 0730 con indicate 2-4 group prevent 3) 1650cm' indicate in aldehyde group Psefes } 17 1490 con indicate aromatic compound present 5) 1200 con indicate e Hipy pregat by 7 60738 multiplet 1008 (siging let) 43. HNMR M A oV798 Csingles ) 3.88 singer BER 10 om F 1490 I 2720on! These e 2200001 1200.cn Remarorong compound Containing mo methyl gooup present expected p-toluidine. but this methyl show peak at 236.