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阅读下列材料，并回答有关问题。1865年，凯库勒从苯的化学式C 6 H 6 出发，结合以往研究的成果，综合提出了苯的结构式 根据现代物理方法如X射线法、光谱法等证明了苯分子是一个平面正六边形构型，且其中的碳碳键是一种介于碳碳单键和碳碳双键之间的独特的键。由于苯分子结构中的正负电荷重心重合。所以苯是一种非极性分子，易溶解许多非极性的有机物及澳单质和碘单质等，不溶于水，密度为0. 879 g/cm 3 ，沸点为80.5℃。 苯能与浓硝酸在浓硫酸存在时发生取代反应，生成硝基苯 反应温度应控制在50℃～60℃。温度过导致苯的挥发及浓硝酸的分解。 (1)苯分子中各碳碳键的夹角是多少度？ (2)你认为苯的二氯取代物有几种？ (3)用苯提取溴水中的溴或碘水中的碘是利用了苯的什么性质？ (4)由于苯与硝酸的取代反应对温度要求严格，我们应该如何科学地加热？如何监控温度？
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