Show Unsaturation answer
Rule 1, replace halogens with hydrogens, gives C4H10
4 - 10/2 + 1 = 0 degrees of unsaturation.
No pi bonds and no rings.
Show IR answer
The bands at 3000-2850 indicate C-H alkane stretches. The bands in the region 1300-1150 could indicate C-H wag (-CH2Br) of an alkyl halide.
Show Structure answer
This is the structure. See if you can assign the peaks on your own.
Show NMR answer