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How to identify cyclopropane, cyclopentene, toluene and tert-butyl benzene

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Super VeDAz

Super VeDAz

First, prepare four clean beakers or small test tubes, and put them in four substances, which smell slightly. Among them, toluene C and tert-butyl benzene D are fragrant, and the rest are cyclopropane. Note that bromine water can't be used here. Small cycloalkanes such as cyclopropane will undergo a free radical ring-opening reaction with bromine at room temperature to make bromine water fade, while the reaction with chlorine requires ferric trichloride as a catalyst to add potassium permanganate solution to CD test tubes. Toluene fades in purple, while tert-butyl benzene does not fade. Potassium permanganate can oxidize hydrocarbon groups directly connected to benzene rings into carboxyl groups, but it requires hydrogen atoms on carbon directly connected to benzene. Therefore, tertiary benzene does not respond

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