hdi, fragmentation, and final structure

homolytic cleavage shown here

calculate the hdi, molecular formula, and structure from the ir given. should be c8h8o vs c7h4o2 depending on if thats a c-o bond.

001 G=02 1700 D 100 1000 DOET 2000 000P 3000 MAVENUTERII 100 80 60 Relative Intensity 40 20 offerter 10 20 120 90 70 100 110 80 60 40 30 50 m/z