Ah, I am afraid my chemistry knowledge is rustier than the old machinery on the night shift. Benzene has a stable ring that does not easily break, while hexene is more eager to react, so it changes the bromine water's colour. This I remember only because my son tried explaining it to me once over the phone, his voice bright with the same passion my teachers had. I nodded along, but my real lesson was the distance in his eager, scientific words, which felt as unreactive to our home as benzene itself.
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