Bromination of Ethylene

C2H4 + Br2 → C2H4Br2

Visão geral

Ethylene reacts with bromine in an electrophilic addition reaction to form 1,2-dibromoethane. The brown color of bromine water is decolorized instantly, making this the classic qualitative test for unsaturation (C=C double bonds). The mechanism involves a cyclic bromonium ion intermediate.

Participantes

Papel Substância Coeficiente Estado
Reagente Ethylene C₂H₄ 1 (g)
Reagente Bromine Br 1 (l)

Exemplo do cotidiano

The bromine water test for alkenes is one of the most dramatic color-change tests in organic chemistry: brown instantly becomes colorless.

Importância industrial

O 1,2-dibromoetano foi historicamente utilizado como sequestrador de chumbo na gasolina com chumbo e é atualmente um importante intermediário químico.

Propriedades

Tipo
Organic
Reversível
Não
Energia
Exotérmico
ΔH
-121,0 kJ/mol

Reações relacionadas

Swern Oxidation Oxidation of Secondary Alcohol to Ketone Claisen Condensation (Ethyl Acetate) Kolbe Electrolysis Baeyer-Villiger Oxidation Beckmann Rearrangement (Cyclohexanone Oxime) Catalytic Hydrogenation of Ethylene Condensation Polymerization (Nylon 6,6) Cope Rearrangement Epoxidation of Alkenes (mCPBA)

Frequently Asked Questions

What is the equation for Bromination of Ethylene?
The balanced equation is: C₂H₄ + Br₂ → C₂H₄Br₂.
What type of reaction is Bromination of Ethylene?
Bromination of Ethylene is a organic reaction.
Is Bromination of Ethylene exothermic or endothermic?
Bromination of Ethylene is exothermic (releases energy). The enthalpy change (ΔH) is -121.0 kJ/mol.