a carbo cation intermediate is formed

 

as rxn with Br is slow.........it givs time for rearrangement and formation of a more stable carbocation ............. and Br is added..........

 

plzzzzz correct me if i'm wrong

 

cheeeers

HBr will add across carbon carbon double bond. Molecule is symetrical, no question of Markownikoff's rule.HBr will normally not affect the ether linkage; similarly it will nor react eith the anhydride linkage shown.

During addition of HBr first H adds to form a carbocation, which may rearrange to more stable carbocation. In this reaction there is no possibility of rearrangement as the adjoining carbon does not have any hydrogen. The lone pair of electrons on oxygen of ether linkage will also not participate as it will lead to formation of one ring eith three or four members, which will be less stable than the one existing.

Structure u can draw by adding HBr to C=C.