Question

please help!

c 3.86 ppm, singlet, 3H d-2.52 ppm, singlet, 3H Compound A: CoH1002 TSI a 7.89 ppm, doublet, 2H b-7.89 ppm, doublet, 2H Unsat. Index- (2C+2-H-X+N)/2 8, ppm 9.0 7.0 60 3.0 2.0 ? 3, 5-dimethylbenzaldehyde, NaOH, H2O, heat h 2.31 ppm, singlet, 6H 3-1 a #8 ppm, doublet, 2H b-7.60 ppm, doublet, 1H c- 7.33 ppm, singlet, 2H Compound B: C1H1O2 g-3.86 ppm, singlet, 3H d-7.28 ppm, doublet, 1 H e 6.99 ppm, singlet, 1H C f 6.98 ppm, doublet, 2H unsat. Index (2C +2-H-X + N)/2 8, ppm 7.5 7.0 6.0 5.0 4.5 4.0 3.5 3.0 2.5 20 1.5

Answer 1

The structure of the compound A and B is with the molecular formula C9H10O2 AND C18H18O2 respectively is given in the image below:

In the IR spectrum, the two most intense bands will be obtained for C=O and C-O groups. In addition to these, C=C aromatic stretching frequency band will be obtained and C-H stretching for methyl and the aromatic group can also be noticed.