Physical properties and chemical properties of acetylene

4. Properties of acetylene Physical properties of acetylene: pure acetylene is no color, no odor, slightly lighter than air, slightly soluble in water, soluble in organic solvents gas. Acetylene's chemical properties: acetylene's chemical properties are more active, can occur ① addition reaction: CH ≡ CH + 2Br2 → CHBr2-CHBr2 1, 1, 2, 2 - tetrabromoethane ② oxidation reaction: a. so that the purple of the acidic solution of potassium permanganate faded. b. Acetylene's flammability: 2CH2 + 5O2 → 4CO2 + 2H2O phenomenon is: bright flame, smoke, exothermic. c. Acetylene's flammability: 2CH2 + 5O2 → 4CO2 + 2H2O phenomenon is: bright flame, smoke, and the same time. d. Acetylene is the most important gas in the world. Exothermic. ③ polymerization reaction using acetylene to make bromine or potassium permanganate acidic solution discoloration to identify the alkane and acetylene, or to remove the alkane in the impurity acetylene. Acetylene and hydrogen chloride addition product vinyl chloride contains carbon-carbon double bond, it can also occur polymerization reaction: the product polyvinyl chloride is an important synthetic resin.