Arenes

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  • Created by: J.E.C.
  • Created on: 29-04-14 17:17
Each carbon atom in benzene has 4 outer electrons, __ of them form single bonds with...?
3, the two carbon atoms next to them in the ring and one hydrogen atom
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The remaining electrons...? This sharing is known as...?
Spread out evenly and are shared across all 6 of the C atoms in the ring? Electron delocalisation.
2 of 10
Why is the modern benzene structure so stable?
Electrons repel one another, so a system in which they are delocalised and as far apart as possible will involve minimum repulsion and will be stabilised.
3 of 10
The enthalpy change when cyclohexane reacts with hydrogen is...?
-120 KJ per mol
4 of 10
EThe expected value for enthalpy change when adding hydrogen to the kekule structure would be...?
-360 KJ per mol
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However the enthalpy change valuse for benzene was found to be...? This means benzene must be...?
-208 per mol. More stable than the kekule structure.
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Arenes are...?
Hydrocarbon rings stabilised by electron delocalisation.
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A benzene ring in which one hydrogen atom has been substituted for another group is called...? It has the formula...?
A phenyl group. C6H5
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Benzene rings can be fused together to give ___ __ __, where the rings join they __ a pair of carbon atoms?
Fused ring system, share.
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In fused rings systems we draw the rings with __ __ to show that the delocalisation...?
Double bonds, extends over all rings.
10 of 10

Other cards in this set

Card 2

Front

The remaining electrons...? This sharing is known as...?

Back

Spread out evenly and are shared across all 6 of the C atoms in the ring? Electron delocalisation.

Card 3

Front

Why is the modern benzene structure so stable?

Back

Preview of the front of card 3

Card 4

Front

The enthalpy change when cyclohexane reacts with hydrogen is...?

Back

Preview of the front of card 4

Card 5

Front

EThe expected value for enthalpy change when adding hydrogen to the kekule structure would be...?

Back

Preview of the front of card 5
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