Flashcards
Benzene and aromatic compounds
Cards in this deck (10)
- 1Kekules basic structureHe proposed that benzene was a flat ring of carbon atoms with alternating single and double bonds, he later adapted this to say the double and single bonds are constantly flipping
- 2Bond reason to reject kekules modelYou'd expect there to always be three c-c bond lengths of (154pm) and three C=C (134pm),but they all have a bond length of 140lm so it can't be right
- 3Delocalised modelThis states the p orbitals of all six carbon atoms overlap to make a system of two ring clouds above and below the Benzene
- 4Hydrogenation disregarding kekules structureIf you hydrolyse an a Alkene you get an enthalpy change of -120. So the expected value would be -360 for hence but it is actually -208. This indicates benzene is more stable, and disregards kekules model
- 5Common prefixes for benzeneCl - chloro
Br - bromo
NO2 - nitro
CH3 - methyl - 6Benzene phenyl group namesOH - phenol
NH2 - phenylamine - 7Delocalised electrons in benzeneThe pi bonded electrons are delocalised, which spreads out the charge across the carbon atoms
- 8What is a delocalised electronOnes which are spread over more than 2 atoms
- 9Why is benzene so unreactiveThe electrons are spread out meaning a low charge density and thus means it does not attract electrophiles
- 10Properties of the benzene rings120 bond angles and the delocalised rings are planar
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- A-Level Chemistry (6.1) Flashcards on Benzene and aromatic compounds , created by Reuben Veysey-Smith on 21/11/2016.
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- Reuben Veysey-Smith
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