If a halogen, such as bromine, is added in the place of hydrogen, the reaction is called halogenation.

果加入卤素，，替氢，则该应称为卤。

You also learned a little bit about cis-trans isomerism and learned a few important reactions of alkenes and alkynes such as hydrogenation, halogenation, and polymerization.

您还了解了一些构现象，并了解了烯烃和炔烃的一些重要应，例氢、卤和聚合。