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（13分） （1）（7分）下表列出了a-f六种元素在周期表前三周期的位置。 a b c d e f 请回答下列问题： ①c元素的名称是 ，d元素位于 族。 ②用元素符号表示，六种元素中， 元素的性质最稳定， 元素的原子半径最大。 ③非金属性b c。(填“大于”“小于”) ④用化学式表示，六种元素中，最高价氧化物属于两性氧化物的是 ，最高价氧化物对应水化物酸性最强的是 。 （2）（6分） ①有机气体A是一种植物生长调节剂，其相对分子质量为28。A通入溴水中，能使溴水褪色。A的分子式是 ，其与溴水反应的化学方程式是 ，反应类型为 反应。 ②同分异构现象的广泛存在是造成有机物种类繁多的重要原因之一。C 4 H 10 有两种同分异构体，其结构别是 ， 。
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