ibly ▁into ▁b rom ine , ▁b rom ine ▁trif lu or ide , ▁and ▁b rom ine ▁p enta flu or ide . ▁It ▁thus ▁cannot ▁be ▁obtained ▁pure . ▁It ▁may ▁be ▁synth es ised ▁by ▁the ▁direct ▁reaction ▁of ▁the ▁elements , ▁or ▁by ▁the ▁comp ro port ion ation ▁of ▁b rom ine ▁and ▁b rom ine ▁trif lu or ide ▁at ▁high ▁temper atures . ▁B rom ine ▁mon och lor ide ▁( Br Cl ), ▁a ▁red - b rown ▁gas , ▁quite ▁readily ▁dis soci ates ▁revers ibly ▁into ▁b rom ine ▁and ▁ch lor ine ▁at ▁room ▁temperature ▁and ▁thus ▁also ▁cannot ▁be ▁obtained ▁pure , ▁though ▁it ▁can ▁be ▁made ▁by ▁the ▁revers ible ▁direct ▁reaction ▁of ▁its ▁elements ▁in ▁the ▁gas ▁phase ▁or ▁in ▁carbon ▁t et rach lor ide . ▁B rom ine ▁mon of lu or ide ▁in ▁eth an ol ▁readily ▁leads ▁to ▁the ▁mon ob rom ination ▁of ▁the ▁a rom atic ▁comp ounds ▁Ph X ▁( para - b rom ination ▁occurs ▁for ▁X ▁= ▁Me , ▁But , ▁O Me , ▁Br ; ▁meta - b rom ination ▁occurs ▁for ▁the ▁de activ ating ▁X ▁= ▁– CO 2 E t , ▁– CH O , ▁– NO 2 ); ▁this ▁is ▁due ▁to ▁heter ol yt ic ▁f ission ▁of ▁the ▁Br – F ▁bond , ▁leading ▁to ▁rapid ▁elect roph il ic ▁b rom ination ▁by ▁Br + . ▁ ▁At ▁room ▁temperature , ▁b