Hello, please provide a detailed explanation. The problem that needs to be solved is problem 123, I added the solution sheet to be filled and an example of what needs to be done

Problem 123 IR: List bands and possible/probable structural units responsible Band (cm1) Possible stretches/functional groups MS: Molecular Formula IHD(DU)= (Show calculation) If you need more space, add any additional signal info here: Mol. Form. C3H4O2IHD= (Show calculation) IHD=2(23+2)4=2 IR: (List bands and possible/probable structural units responsible) 13 C. NMR: Problem 91