Question

Question 7 (2 points) Which of the following dienes can undergo the Diels-Alder reaction? II III IV a) 11 Ob) III Oc) Od IV Question 8 (2 points) How would you use 'H NMR spectroscopy to distinguish between the following compounds based on the benzene ring protons? II O O a) Benzene protons for I show up between 6.0 - 7.0 ppm and Il between 7.0 - 8.0 ppm Ob) Benzene protons for I show up between 7.0 - 8.0 ppm and Il between 6.0 - 7.0 ppm O c) Benzene protons for I and Il both show up between 7.0 - 8.0 ppm Od) Benzene protons for I and Il both show up between 6.0 - 7.0 ppm

Answer 1

0 In the Diels-Alder reaction Homo angular conjugated dienes used. and care I T open Chain Homo angular Non Conjugated diene Hetoro angula + Conjugated diene Conjugated diene y so sol Under go in the Dies-alder reaction! (II) (b)

(8) S value increase de shidding → Shielding - & vane decrease the Election withdrawing group moves electron density away from Proton This Called "deshielding" so svalue increase And election donating groups which Shield the Protows s value decrees. so Election withdrawing group ( Ion (I) 2 7.0 8.0 ppm COW Om C Electron donating group. 6.0- 7.0" ppm COPE (6) Benzene Protons for I show up between 7.0 8.0 PPM and I ben zene 6.0-7.0ppm/ b