Sec⊥Introduction& Properties Hydrocarbon with carbon-carbon double bonds Sometimes called olefins,"oil-forming gas" Pi bond is the functional group. More reactive than sigma bond. Bond dissociation energies: C=C BDE 611 kJ/mol C-C BDE -347 kJ/mol -Pi bond 264 kJ/molSec 1 Introduction & Properties Hydrocarbon with carbon-carbon double bonds Sometimes called olefins, “oil-forming gas ” Pi bond is the functional group. More reactive than sigma bond. Bond dissociation energies: C=C BDE 611 kJ/mol C-C BDE -347 kJ/mol Pi bond 264 kJ/mol