# Is syn addition possible with Br2? [closed]

How is this reaction correct? I have studied until now that with $$\ce{Br2}$$ only anti-addition takes place.

• Please don’t ever draw alkynes with a bond angle that isn’t 180°. Sep 19 at 12:48
• What is $\ce{M}$ in $\ce{M2O\bond{-}}$ group on your diagram? It also would be nice if you could add chemical names and fix issues with molecular geometry. Sep 19 at 21:43