试题与答案

有机物A可由葡萄糖发酵得到，也可从酸牛奶中提取。纯净的A为无色粘稠液体，易溶于水

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题型：选择题

题目：

有机物A可由葡萄糖发酵得到，也可从酸牛奶中提取。纯净的A为无色粘稠液体，易溶于水。为研究A的组成与结构，进行了如下实验：

实验步骤解 释 或 实 验 结 论
（1）称取A 9.0g，升温使其汽化，测其密度是相同条件下H2的45倍。试通过计算填空：

（1）A的相对分子质量为：        。

（2）将此9.0gA在足量纯O2充分燃烧，并使其产物依次缓缓通过浓硫酸、碱石灰，发现分别增重5.4g和13.2g。 

（2）A的分子式为：              。

（3）另取A 9.0g，跟足量的NaHCO3粉末反应，生成2.24LCO2（标准状况），若与足量金属钠反应则生成2.24LH2（标准状况）。（3）用结构简式表示A中含有的官能团：

                           。

（4）A的核磁共振氢谱如下图：

 

（4）A中含有       种氢原子。

（5）综上所述，A的结构简式            。

答案：

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考点：芳香烃的通式卤代烃苯的同系物苯
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