7/22/2019 13.6 Benzene Delocalisation Stability

http://slidepdf.com/reader/full/136-benzene-delocalisation-stability 1/2

Original slideprepared for the

Bonding in benzene

C C

C C

C C H

HH

H

HH

6 electrons in a

delocalised  bond

above and belowthe plane of theatoms

7/22/2019 13.6 Benzene Delocalisation Stability

http://slidepdf.com/reader/full/136-benzene-delocalisation-stability 2/2

Original slideprepared for the

theoretical

value 

real value 

Energy diagram

Enthalpy(kJ mol-1)

-120 

+ H2 

+ 2H2 

-240 -208

 

+ 3H2 

-152 kJmol-1 delocalisation

energy 

+ H2 

-120 

+ 3H2 

-360