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

Epoxidation of Alkenes (mCPBA) Swern Oxidation Oxidation of Secondary Alcohol to Ketone E2 Elimination (Dehydrohalogenation) Claisen Condensation (Ethyl Acetate) Aldol Condensation of Acetaldehyde Kolbe Electrolysis Baeyer-Villiger Oxidation Beckmann Rearrangement (Cyclohexanone Oxime) Dehydration of Ethanol

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.