$^1$H NMR: $\delta$ 1.69 ppm (3H, doublet, J = 7.2 Hz); $\delta$ 5.86 ppm (1H, doublet, J = 14.7 Hz); $\delta$ 6.03 ppm (1H, doublet of a quartet, J = 14.7 Hz & 7.2 Hz)
$^{13}$C NMR: $\delta$ 132.84 ppm, $\delta$ 104.75 ppm, $\delta$ 18.24 ppm.
MS $\frac{m}{z}$ major peaks: 39, 41, 119 & 121
Identify the isomer.
Hint (Use ONLY IF you want): Pay attention to the coupling constants - J values and the splitting patterns in the $^1$H NMR.
3-bromo-1-propene
2-bromo-1-propene
trans-1-bromo-1-propene
cis-1-bromo-1-propene