The alkane that yields two isomeric monobromo derivatives

$\underset{1-\mathrm{bromo} \mathrm{propene}}{{\mathrm{CH}}_3{\mathrm{CH}}_2{\mathrm{CH}}_2\mathrm{Br}} \& \underset{2-\mathrm{bromo} \mathrm{propene}}{{\mathrm{CH}}_3-\underset{\underset{\mathrm{Br}}{|}}{\stackrel{\stackrel{\mathrm{H}}{|}}{\mathrm{C}}}-{\mathrm{CH}}_3}$

Two Isomers possible for monobromo derivative of propane.