Synthesis(4 points each,16 points in all OC.H COOH OH 40 SECTION IV MECHANISMS SCORE ⑤points each,15 points in al业 41.Write a complete mechanism for the following reaction. 人B 42.Writea mechanism for the a arrows and indicate equilibrium arrows where relevan 第3页共3页第 3 页 共 3 页 Synthesis(4 points each, 16 points in all.) 37. OC2H5 O O O 38. NH2 Br 39. COOH 40. OH O O SECTION IV MECHANISMS SCORE (5 points each, 15 points in all) 41. Write a complete mechanism for the following reaction. Br2 Hv Br 42. Write a complete mechanism for the following reaction. O Cl + CH3CH2OH O OCH2CH3 + HCl 43. Provide a mechanism for the following reactions. Show the movement of electrons with the appropriate arrows and indicate equilibrium arrows where relevant. O O Br FeBr3 Br2