Bromination of Ethylene

C₂H₄ + Br₂ → C₂H₄Br₂

Обзор

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.

Участники

Роль	Вещество	Коэффициент	Состояние
Реагент	Ethylene C₂H₄	1	(g)
Реагент	Bromine Br	1	(l)

Пример из жизни

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

Промышленное значение

1,2-Dibromoethane was historically used as a lead scavenger in leaded gasoline and is now an important chemical intermediate.

Свойства

Тип: Organic
Обратимая: Нет
Энергия: Экзотермическая
ΔH: -121,0 kJ/mol

Связанные реакции

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.