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[問題] (Chem) Benzene

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(Chem) Benzene

Why hydrogen atom in benzene will not be substituted?
   

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why not?
2010 CE 4A4B 28分
Phy Bio Math Add. Math A
中文 English Chem Econ B
2012 AL
中化 UE Phy Chem Pure Math

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.....many examples of electrophilic substitution.....of benzene...

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Sorry for my poor questioning skills
What I really want to know is why C-H bond in benzene is stronger than the normal one?

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intermediate between single and double bond and also delocalised system
2010 CE 4A4B 28分
Phy Bio Math Add. Math A
中文 English Chem Econ B
2012 AL
中化 UE Phy Chem Pure Math

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回覆 5# wesley1218 的帖子

partial double bond character

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benzene既reaction 唔係都係hydrogen 比人substituted 咩? electrophile attack ,hydrogen個bond donate electron to positive c

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benzene are sp2 hybrideized .hydrogen atoms of benzene ring are bonded to phenyl carbon atoms by overlapping of sp2 hybridized orbital and s orbital. Electrons are more attracted by and closer to the nucleus, so the resulting bond is stronger and not susceptible to substitute

[ 本帖最後由 small0120 於 2012-4-23 01:41 AM 編輯 ]

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resonance

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