Answer Happy

Please analyze these IR and HNMR spectrums and tell me whether the product is 1-bromopentane, 1-bromo-3-methylbutane, or 1-bromobutane. Also will need the reasoning behind it. It must be one of these products. Instructor provided HNMR
20 11.5 11.0 10.5 10.0 9.5 9.0 JS 8.5 8.0 7.5 7.0 6.5 6.0 5.5 5.0 4.5 f1 (ppm) S 4.0 3.5 3.0 2.5 2.0 N 1.5 F 19 1.0 0.5 --1000 -900 -800 -700 -600 -500 -400 300 200 -100 -0 F-100 0.0 -0.5 -1.0
CHEM 2212 Viliamson Ether Synthesis 3800 3600 3400 3000 2800 2600 2400 2200 2000 1800 1600 485.31 1400 1200 1000 800 600