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Reagents for distinguishing between cyclobutane and butene. Cyclobutane and butene are common organic compounds with some significant differences in chemical properties. To further understand their differences and characteristics, we need to use specific reagents for testing

1. Bromine aqueous solution 

Bromine aqueous solution can be used to distinguish between cyclobutane and butene. Drop cyclobutane and butene into two test tubes respectively, and then add a small amount of bromine aqueous solution. Observe the color changes in the test tube. If the liquid in the test tube changes from colorless to orange yellow or reddish brown, it indicates that butene has undergone bromination reaction, while cyclobutane has not

2. Potassium permanganate solution 

Potassium permanganate solution can be used to distinguish between cyclobutane and butene. Drop cyclobutane and butene into two test tubes respectively, and then add a small amount of potassium permanganate solution. Observe the color changes in the test tube. If the solution changes from purple to blue-green, it indicates that butene has undergone an oxidation reaction, while cyclobutane has not undergone a reaction

3. Iron trichloride solution 

Iron trichloride solution can be used to distinguish between cyclobutane and butene. Drop cyclobutane and butene into two test tubes respectively, and then add a small amount of ferric chloride solution. Observe the color changes in the test tube. If the solution changes from yellow to purple, it indicates that butene has undergone an addition reaction, while cyclobutane has not undergone any reaction

By observing the reactions of the above reagents, we can distinguish the characteristics of cyclobutane and butene. Cyclobutane is a saturated hydrocarbon with relatively stable chemical properties and is less prone to chemical reactions. Butene is an olefin with strong activity and is prone to reactions such as addition, bromination, and oxidation with other substances

Summary: The reagents that distinguish between cyclobutane and butene include bromine aqueous solution, potassium permanganate solution, and ferric chloride solution. By observing their reactions with cyclobutane and butene, we can understand their differences and characteristics. These reagents have important application value in chemical experiments, helping us better understand the properties and characteristics of organic compounds.