苯同乙烯同样具有碳碳双键为什么化学性质却如此不同?

2025-03-15 11:15:50
推荐回答(5个)
回答1:

其实苯不具有碳碳双键。(下面来自摆渡百科http://baike.baidu.com/view/31340.htm#3)
苯不能使溴水或酸性KMnO4褪色,这说明苯中没有碳碳双键。进来研究证明,苯环主链上的碳原子之间并不是由以往所认识的单键和双键排列(凯库勒提出),每两个碳原子之间的键均相同,是由一个既非双键也非单键的键连接(叫大π键)。(可理解为平均化的价键,介于单键与双键之间,兼具二者性质,既可以取代,又可以加成)
苯分子里6个碳原子都以sp²杂化方式分别与两个碳原子形成σ键、与一个氢原子形成碳氢σ键。由于碳原子是sp²杂化,所以键角是120°,并且6个碳原子和6个氢原子都在同一平面内。另外苯环上6个碳原子各有一个未参加杂化的2p

回答2:

因为苯的分子中有一个稳定的环状闭合大π键。

回答3:

苯中是没有碳碳双键的…苯中的化学键是介于单键和双键之间的特殊价键哦~

回答4:

乙烯是直线型结构而苯是环型结构也并不是单双键相隔所以有不同的性质。苯还有众多迷团现科学家还不能清楚解释。

回答5:

苯的双键比乙烯短

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