Question

Determine the structure of C8H8O2 using H-NMR, C-NMR, and IR Spectrum and each signal assigned to H's in the structure.

For each spectrum, the complete structure of the unknown is to be determined, and each signal assigned to H's in the structure. These are to be written on the printout of each spectrum.

Determine the structure of C8H8O2 for the H-NMR, C-NMR, and IR Spectrum

Answer 1

solution: The given molecular formula is c8H902 :. site of unsaturation - 20 +2 +N-X-H Where x- halogen H- hydrogen N- nitrogen c carbon. :: site of unsaturation - 2x8+2-8 = 18-8 : Compound contain 5 site of unsaturation. :. In the given whor the S x 7.88 ppm (d) for 24 para position re proton cat indicate s~ 7.0 ppm (d) for at and disubstituted aromatic ring at indicatut tut - o - 6-H attached to aromatic t da 9.88 ppm (s) for ning -H group and . 8 ~ 3.83 ppm (s) for 3H in dicale - OCH3 attached to aromatic ring. CH ... The structure of compound is 1 0 - CH₂ REDMI NOTE 5 PRO MI DUAL CAMERA

. C NMR Sa. 191. ppm C-H 129.2 ppm - Sa 12.0 ppm Sx 132 0ppm da 114.0 ppm & ~ 166.4 ppm da 114.0ppm - CH2 sz 55.8 ppm IR - CH +68 102-1688 cnt group of for carbonyl caldehyde .C-H stretching alchehyde 2830 - 2695 cm melina C-H bending of aldenyde 1390-1380 cm medium cro stretching for alkyl aryl ether 12.75-1200 cm strony 4,4 disubstituted aromatic ring 900-600 cm