please help with the last part. thanks!

4. The following compound can be made in one reaction usine propunal as a starting material Figure out the structure and assign the relevant bands in the IR spectrum.' label each sigral in the H-NMR and the C-NMR. Finally, assign the structure of the two largest signals in the MS. 4000 2000 1500 3000 C-H SP3 CO TODO (53 pm) opp 2005 (lakid on struche (ppm) (26 ppm) 75 GH 73 Relative tensity 30 TH 2H M-104 1 10 porn Lektor Chevy Sifhinkgration split neighbors 0.9 SH 2 1.6 2H 3.5 CH 4.4 1. F 2 5 o 15 c (53ppm) 0 (10 ppm) D ( 115ppm) A B (28 pom) c (53 ppm) 105 m) min