下面3题 麻烦各位高手罗^^ 谢谢! 1.What productis likely to be obtained when 1-fluoro-2,4-dinitrobenzene is treated with sodium ethoxide? A)2,4-dinitrobenzene B)1-ethoxy-2,4-dinitrobenzene C)2,4-dinitrophenylsodium D)no reaction is likely to occur Ans:(D). 但我想选(B)---走SN-Ar? 2.which of the following substances readily undergoes ring bromination with Br2,even in the absence of a Lewis acid catalyst? A) 2,4-dinitrotoluene B) 2,4-dimethylbenzoic acid C) 3-nitroaniline D) 4-bromophenyl acetate E) 1,3-benzenediol Ans: (D). 我想选(E),因为我想OH是强活化基? 3.What product is likely to be obtained when 1-bromo-2-nitrobenzene is heated with aqueous NaHCO3? A)2-bromophenol B)2-nitrophenol C)2-bromophenyl carbonate D)2-nitrophenyl carbonate E)Sodium 2-nitrophenoxide Ans:(E). 我想选(B),因为: 酸度: H2CO3 > 2-nitrophenol ,所以平衡式: 2-nitrophenol + NaHCO3 <----(--->) 2-nitrophenoxide + H2CO3 我想应该倾向往左, 这样此题为什麽不能选(B), 因为NaHCO3硷性不够强到可以拔掉 2-nitrophenol 上的氢吧 --

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