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

# 4fe to both the spectios, best fitted untuwn compound will be- И, С1 4и, Hz 4 telt-butylphenol. тіс № '-мме ☺ gH suight - 103 ppur 2H-Cavriatii) ~ 7.2 ppuu - doublela . 2 Hy-caromatic) a 618 ppm - doublet @ 0-H- (alcoholic) u 5.2 ppm – singab. IR spectra in A frances Thanks! Please yati ? Enamr Imo Trausmittance Co-H stretch ~3300 1 H-Bonded - c-H (stretch) sp (42900 cy) aromatic (C=C) a 1600-1800 cant 4000 3800 3600 3400 3200 3000 2300 2600 2400 2200 sec 1800 1600 1400 1200 lovo . e wave number Woune w cant) ! o- vanillin - Zu IR c=o peak absent at n 1120 cust –9H – Singeet' absent. I ! Benzoic acid 'H-uur doon at 11.-12 ppm absent ! p-tolmidine – 94-equivalent abraut, renol - aH - salicylic acid - acidic proton - 11-12 ppen absent 4-aminobenzoic acid Acidic proton - 11-12 ppm absent. " u