Bromination of Ethylene

C₂H₄ + Br₂ → C₂H₄Br₂

Tổng quan

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.

Người tham gia

Vai trò	Chất	Hệ số	Trạng thái
Chất phản ứng	Ethylene C₂H₄	1	(g)
Chất phản ứng	Bromine Br	1	(l)

Ví dụ thực tế

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

Tầm quan trọng công nghiệp

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

Tính chất

Loại: Organic
Thuận nghịch: Không
Năng lượng: Tỏa nhiệt
ΔH: -121,0 kJ/mol

Phản ứng liên quan

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.