[heycoa]

Here is the image:



I am trying to solve the reaction by mono substitution but I do not think that is correct.  Please *delete me*

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[heycoa]

I actually figured it out.  The double bond breaks down. 

[magician4]

that's correct: HBr will add to the double bond (and hence the double bond will "break down")


but that's only half of the story, presumably: where will the proton go and why  (followed by bromide - addition to the resulting carbocation) ?  that's two different products resulting thereof,  either way!

  this bit seems to me to be the core of the problem given to you


  you're only halfway there, if that much


regards

Ingo