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

如果加入卤素，如溴，，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.

您还了解了反异构现象，并了解了烯烃和炔烃的重要反应，例如、卤和聚合。