[Sona]

From the IR data, I've attached here, it is clear that it is a monosubstituted benzene. Now in the side chain what may present? isopropyl or normal propyl? Can it be said from this Ir data?

[wildfyr]

You can tell if specifically isopropyl is there, but other chains are tough to ID. The isopropyl split 1370 + 1385 is pretty characteristic. Some easy googling can tell you other alkane peaks, but they are not easy to interpret in my experience