【单选题】【消耗次数：1】
电子在原子核外空间的单位体积内出现的概率，称为：（ ）。
①
密度面
②
同位素
③
电子云密度
④
电子图密度
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【判断题】
酚羟基中的氧原子为sp2杂化，其中1个p轨道未参与杂化，且含有一对未成键电子，它可参与苯环的大π键，形成p-π共轭体系，氧原子上的电子云向苯环转移。其结果是：（1）苯环上的电子云密度相对增大，环上的亲电取代反应容易进行；（2）C—O键间电子云密度相对增大，C—O键变得更牢固，-OH不易被取代；（3）氧原子上的电子云密度相对降低，O—H键间的电子云向氧原子转移，O—H键极性增强，H较活泼，表现出一定的酸性。
①
正确
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错误
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