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【简答题】
（18分）氯丁橡胶M是理想的电线电缆材料，工业上可由有机化工原料A或E制得，其合成路线如下图所示。 已知：H 2 C=CH-C≡CH由E二聚得到。 完成下列填空： (1)A的名称是_________________，反应③的反应类型是_________反应。 (2)写出反应②的化学反应方程式： _______________________________________。 (3)为研究物质的芳香性，将E三聚、四聚成环状化合物，写出它们的结构： _________、_________ ；鉴别这两个环状化合物的试剂为_________________。 (4)以下是由A制备工程塑料PB的原料之一一l，4-醇(BDO)的合成路线： 写出上述由A制备BDO的化学方程式： 反应④_______________________________________________________________ 反应⑤_______________________________________________________________ 反应⑥_______________________________________________________________
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