4.Write reasonable and stepwise mechanisms for the following reactions(15points). (1) NO2 NO2 oN--a·EoNa一oN-oa+a "CCo 00 (A) (B) (C) O 4. Write reasonable and stepwise mechanisms for the following reactions (15 points). O2N NO2 Cl + EtONa O2N NO2 OEt + NaCl (1) O O OH H+ 100 oC O (2) O O OH OH + (3)