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【简答题】
（9分）、A、B、C、D、E均为有机化合物，它们之间的关系如图所示（提示：RCH=CHR'在酸性高锰酸钾溶液中反应生成RCOOH和R'COOH，其中R和R' 为烷基）。回答下列问题： （1）直链化合物A的相对分子质量等于100，A分子中碳、氢元素的总质量分数为0.68，其余为氧元素，则A的分子式为 ______________ （2）A可以与金属钠作用放出氢气，能使溴的四氯化碳溶液褪色，则A的结构是__________。 （3）已知B与NaHCO 3 溶液完全反应，其物质的量之比为1：2，则在浓硫酸的催化下，B与足量的C 2 H 5 OH发生反应的化学方程式 ____________________________ ， 反应类型为 。 （4）D的同分异构体中，能与NaHCO 3 溶液反应放出CO 2 的有 种，其相应的结构是 。
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