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由环己烷可制得1, 4 – 环己二醇，下列有7步反应(其中无机产物都已略去)，其中有2步属于取代反应，2步属于消去反应，3步属于加成反应。 试回答： (1) 反应__________属于取代反应。 (2) 化合物的结构：B__________，C___________； (3) 反应④所用试剂和条件是___________； (4) 写出反应②、⑤的化学方程式：反应②_________________反应⑤________________
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