题目

A famous teacher was speaking to the students at our school. He began his lesson by holding up a ￥100 bill. Then he said to the three hundred students, “Who would like this ￥100 bill?” The students began to put up their hands at once. Then he said, “I am going to give this ￥100 to one of you, but first, let me do this.” He then made the bill into a ball. Then he said, “Who wants it now?” The hands went back into the air. “Well,” he said, “What if I do this?” and he dropped it on the floor and stepped on it. He picked up the dirty, crumpled bill and said, “Who某有机物A（只含C、H、O三种元素）是一种重要化工生产的中间体。已知：①A的蒸气密度是相同状况下氢气密度的83倍，分子中碳原子总数是氧原子总数的3倍。②A属于芳香族化合物，其苯环上只有一个取代基，且取代基碳链上无支链；③A可与NaHCO3溶液作用，产生无色气泡；④A在一定条件下可与乙酸发生酯化反应；⑤A存在如下转化关系：试根据以上信息回答问题：   （1）A的分子式__________________；A中含氧官能团的名称__________________。   （2）D的结构简式为__________________。   （3）写出A→C和A→B的化学反应方程式（注明反应条件），并注明反应类型：A→C：________________________，反应类型：__________________；A→B：________________________，反应类型：__________________。   （4）符合下列三个条件的A的同分异构体的数目共有__________________个。①苯环上只有两个邻位取代基②能与三氯化铁溶液发生显色反应③一定条件下可以水解生成两种物质写出其中任意一个同分异构体的结构简式______________________________。