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Molecular Formula C4H8, molecular weight 56.10, two kinds of isomers, is a colorless gas. Exist in gas, and air can form an explosive mixture. Do not dissolve in water, soluble in alcohol, ether, etc.. 1-butene - CH3-CH2-CH structure SR = CH2. -185.4 ° C melting point, boiling point -6.4 ° C Heat oil can be obtained crack, or concentrated sulfuric acid and butanol activity. 2-butene - CH3 structure SR-CH = CH-CH3. A colorless gas with cis-and trans-isomers of two. Cis : -139.3 ° C melting point, boiling point of 372 ° C; Trans : Melting Point : -40.0 ° C, the boiling point 0.88 ° C
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