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已知： （R、R′表示烃基或官能团） 有机物A是一种医药中间体，图显示其相对分子质量为130．已知0.5molA完全燃烧只生成3molCO 2 和2.5molH 2 O．A可发生如图所示的转化，其中D的分子式为C 4 H 6 O 2 ，两分子F反应可生成含甲基的六元环状酯类化合物． 请回答： （1）1molB与足量的金属钠反应产生的22.4L（标准状况）H 2 ．B中所含官能团的名称是______．B与C的相对分子质量之差为4，B→C的化学方程式是______． （2）D的同分异构体G所含官能团与D相同，则G的结构可能是______． （3）F可发生多种类种类型的反应： ①两分子F反应生成的六元环状酯类化合物的结构是______． ②由F可生成使 Br 2 的CCl 4 溶液褪色的有机物H．F→H的化学方程式是______． ③F在一定条件下发生缩聚反应的化学方程式是______． （4）A的结构是______．
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