Aromatics

• What is the bonding in benzene 


  Each carbon has 3 covalent bonds
• What is the shape of benzene 


  It is a planar compound with formula C6H6

  It has 6 carbon rings

  and the carbon carbon bonds all have equal length
• Explain the stability of benzene 


  The enthalpy of hydrogenation of cyclohexene is -120(1 double bond)

  cyclohexan-1,3,5-triene has three doubles bonds so by theory its enthalpy change should be -360

  But Benzene has a actual enthalpy of -208 which is much lower. Making benzene more stable.
• All C=C bonds is benzene are the same length
• The more exothermic a benzene is the less stable it is