Question

Identify which one of the seven unknowns is represented in the data given and why

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

Al to given Spectera :- Ale to 'H-NMR and IR best fitted structure is Ion cabinetic acid. Ha Form 'H-NMR & Thanks! Please rate / 0 -0-1 Calcolo 1) = sog ppm-singht @ -C-o- (Aud) = 12ppm -singht Hy (aromatic) = 8ppm = doublet ( H. Caromatic) = 1ppm = doublet 0 2 (He and Md) (aromatic) = 705ppm = multiplet From IR spectra :- In 3200 cm-t H-bouded -0-H (broad) ~ (c=o) -stretching (Acid) - 1725ant u (C=C) Caromatit) 1600-1400 cums 7 3200 C M ① o- vanillin , 3H-singhet absent, 2h-multiplet absent. (2) Benzoic acid, alcoholic H- signal absent, Her, 2-d, 24-d, iH-s (3) p- to uicine, 3 H- singlet absent in 't Nome ☺ tion here 9-H-sünget ul.2 ppm absent. I 9- Fluorenal , acidic H- u 12ppm absent 6 - correct answer. (7 4 ansinobenzoic acid, 'H-nimr, Here 24-d, 2h-d No- in doublet, Mo, 24-multiplet, -oh signal also absent. ~WMau 5ppm absent. 1