Two methods of preparation of ethylene and the reaction of ethylene with the following:
1. Reaction with bromine
2. Reaction with hydrogen

Equation for the reaction of ethylene with bromine:
C₂H₄ + Br₂ → C₂H₄Br₂

Equation for the reaction of ethylene with hydrogen:
C₂H₄ + H₂ → C₂H₆