下面3題 麻煩各位高手囉^^ 謝謝! 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). 但我想選(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). 我想選(E),因為我想OH是強活化基? 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). 我想選(B),因為: 酸度: H2CO3 > 2-nitrophenol ,所以平衡式: 2-nitrophenol + NaHCO3 <----(--->) 2-nitrophenoxide + H2CO3 我想應該傾向往左, 這樣此題為什麼不能選(B), 因為NaHCO3鹼性不夠強到可以拔掉 2-nitrophenol 上的氫吧 --

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