题目

   Last Friday, at least 5 people were killed by lightning in Nepal.    Lightning strikes are the second most common cause of deaths during natural disasters in the US. The first is floods. Around 400 people nationwide are struck by lightning each year, and of those, 70 people die. That is, more people are killed by lightning than by tornadoes and hurricanes.    Because lightning kills only one or two people at a time, its danger does not receive as much attention as other disasters.    If you hear the thunder, you are in danger from lightning, said Rocky Lopes, a disaster educPTT是近几年来迅速发展起来的新型热塑性聚酯材料，具有优异性能，能作为工程塑料、纺织纤维和地毯等材料而得到广泛应用．其合成路线可设计为：其中A、B、C均为链状化合物，A能发生银镜反应，C中不含甲基，1molC可与足量钠反应生成22.4LH2（标准状况）。请回答下列问题：（1）A中所含官能团的名称为______，B的结构简式为______．（2）由物质C与D反应生成PTT的化学方程式为______，该反应类型为______。（3）D有多种同分异构体，符合下列条件的同分异构体中，写出任意两种的结构简式：______，_________。①能发生银镜反应，但不能发生水解反应②能与FeCl3溶液反应显紫色，但不能与NaHCO3溶液反应③核磁共振氢谱只有3组峰（4）请写出以CH2=CHCH3为主要原料（无机试剂任用）制备CH3CH(OH)COOH的合成路线流程图（须注明反应条件）。（合成路线常用的表示方法为：）_________________________________