【简答题】甜樱桃中含有一种羟基酸(用A表示),A的碳链结构无支链,分子式为C 4 H 6 O 5 ,1.34 g A与足量NaHCO 3 溶液反应,生成标准状况下的气体0.448 L。A在一定条件下可发生如下转化: A B C D E 其中,E的分子式为C 4 H 6 O 6 。已知: + +Zn(OH)X (X代表卤原子,R代表烃基),A的合成方法如下: ①F+BrCH 2 —COOCH 2 CH 3 ...
【简答题】A.The man had placed them in their car. B.The man had forgotten to bring them. C.The woman had lent them to the hotel owner. D.The woman had left them next to the picnic table.