Question

Question 15 (2 points) Which of the following are possible products of the reaction shown? hv NBS Br Br IV Oa) I, II and III ob) I and II Oc) I, II, III and IV od) 1, III and IV Question 16 (2 points) Guess the structure of the compound using your understanding of chemical shifts. 2H PP انه IV oa) III ob) 1 oc) IV od) 11

Answer 1

P.15 Reaction NBS. H Bar Bor t Titt corocet angues is inds 111 1 Explanation step I ho Br B6 step 13-1 12 Br Br + Brod C (۱) (111)

second step Br takes allylic hydrogen to tom allylic ratical which diocetly give two products. from above the plane attack and other from below the plane cetttack ci cand in Obe callyl radical from recorrangement and Bor radical to step I unclergoes then attackeel tem a pro duet لاله So ceoreet ansuer is ds.ell, Child Earl 2.16 ue from have the almr data following signcelsi 1-2 s triplet 34 a, CH2-CH3 b- 2.0 S singlet 32 сH3 Value 2:05 suggest that this carbon is attached to carbonyl carbon nie

Date Page ♡ CH3 2.08 C. 4.20 S quartet 281 -CH2-CH3 high chemical Shift value suggest is cettaeheel that this to oxygen carbon cators atom o-ct2-CH3 we have from Nim. R fragments following t CH3 CH2-CH3 structure ols the compound is с. a H₂C O-CH2-CH3 so correct is b) answer .

Answers are —

Q. 15 — d) I, III and IV

Q. 16 — b) I