Reaction of styrene (phch=ch2) with hbr gives mixture of regioisomers a (major) and b (minor). the 1h nmr spectrum of the mixture shows four signals, amongs

Reaction of styrene (PhCH=CH2) with HBr gives mixture of regioisomers A (major) and B (minor). The 1H NMR spectrum of the mixture shows four signals, amongst others, at 𝛿 5.17, 3.53, 3.15, and 2.00 ppm with relative integration of 2:1:1:6, respectively. The molar ratio of A and B is