The story
From 1 + bromo- + 3 + chloropropane.
Etymology from Wiktionary, CC BY-SA 4.0.
Today it means: A haloalkane with the molecular formula C₃H₆BrCl. It consists of a straight three-carbon propane chain with a bromine atom on carbon 1 and a chlorine atom on carbon 3, giving the structure Br-CH₂-CH₂-CH₂-Cl. Full definition →
From 1 + bromo- + 3 + chloropropane.
Etymology from Wiktionary, CC BY-SA 4.0.