C2H4 + Br2 → C2H4Br2 – Balanced equation

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This is an oxidation-reduction (redox) reaction:

2 Br + 2 e^- → 2 Br^-I (reduction)

2 C^-II - 2 e^- → 2 C^-I (oxidation)

Br₂ is an oxidizing agent, C₂H₄ is a reducing agent.

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Reactants:

C₂H₄ – Ethene
- Other names: Ethylene , CH2=CH2 , H2C=CH2 , R-1150
- Appearance: Colorless gas ; Colourless compressed gas with characteristic odour
Br₂
- Names: Bromine , Molecular bromine
- Appearance: Fuming red-to-brown liquid with pungent odour ; Dark reddish-brown, fuming liquid with suffocating, irritating fumes.

Products:

C₂H₄Br₂
- Names: 1,2-dibromoethane , Ethylene dibromide , Ethylene bromide
- Appearance: Colourless liquid with characteristic odour. turns brown on exposure to light ; Colorless liquid or solid (below 50°F) with a sweet odor. [fumigant]