2.3 Alkenes: Compounds containing the carbon-carbon double bond------Ethene and Propene Hydrocarbons whose molecules contain a carbon-carbon double bond are called alkenes. Ethene (ethylene)and Propene(propylene) H H H H H CH3 Ethene Propene 1. The six atoms of ethene are coplanar 18 2. Bond angles is triangular H 121 Fig. The structure and bond angles of ethene2.3 Alkenes: Compounds containing the carbon-carbon double bond------Ethene and Propene Hydrocarbons whose molecules contain a carbon-carbon double bond are called alkenes. Ethene (ethylene) and Propene (propylene) H H CH3 H H H H H Ethene Propene H H H H 121 118 0 0 1. The six atoms of ethene are coplanar 2. Bond angles is triangular Fig. The structure and bond angles of ethene