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

加入卤素，溴，代替氢，则该反应称为卤。

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.

您还一些顺反异构现象，并烯烃和炔烃的一些重要反应，例氢、卤和聚合。