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甲苯是一种重要的化工原料。某化学实验小组从甲苯经一系列反应合成了化合物C。已知： (1)R-Br+Mg R-MgBr (2) 请完成下列各题： (1)反应①是原子利用率100%的反应，物质X的分子式是_____________。 (2)反应②、③的反应类型分别为 ________、______。 (3)物质A为__________ 。 (4)根据以上信息，请设计合理方案以乙烯和CH 3 MgBr为主要原料合成2，3-丁二醇（其他原料自选，用反应流程图表示，并注明必要的反应条件）。 例： 由乙醇合成聚乙烯的反应流程图可表示为： CH 3 CH 2 OH CH 2 =CH 2
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B.
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C.
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clean
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cleaning
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cleaned
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A.
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B.
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C.
硬盘驱动器托盘
D.
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