Combustion of cyclohexene and cyclohexane

[Diesel85]

Hi, i have a question regarding how dangerous it is to light cyclohexene and cyclohexane.
Here's why. We had a chem experiment in yr 11, where we observe the solubility of alkenes and alkanes in each other and in water, and the ability of cyclohexene to discolor bromine etc. At the end of the experiment, its the habit of many students to mix everything they were experimenting with, into one single test tube. A student in my group mixed all the cyclohexene and cyclohexane into one test tube, and stoppered it. At this point he seemed a little too excited, and decided he wanted to heat the bottom of the tube with the bunsen burner, which was burning blue. Naturally, other students from the group intervened and one of the more aggressive students almost got into a fight. My question is, exactly what would have happened if the test tube was shoved into the bunsen burner's flame? It was a standard size test tube, and at least a third to half of it was filled with the two hydrocarbons.