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
1 of 10
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
5 of 10
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.
6 of 10
Arenes are...?
Hydrocarbon rings stabilised by electron delocalisation.
7 of 10
A benzene ring in which one hydrogen atom has been substituted for another group is called...? It has the formula...?
A phenyl group. C6H5
8 of 10
Benzene rings can be fused together to give ___ __ __, where the rings join they __ a pair of carbon atoms?
Fused ring system, share.
9 of 10
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
Card 4
Front
The enthalpy change when cyclohexane reacts with hydrogen is...?
Back
Card 5
Front
EThe expected value for enthalpy change when adding hydrogen to the kekule structure would be...?
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