Isomerism

There are total 5 isomers (including stereoisomers) of compound having formula $ \mathrm{C}_{4} \mathrm{H}_{9} \mathrm{Br} $

1-bromobutane $ \rightarrow $

$ \mathrm{CH}_{3}-\mathrm{CH}_{2}-\mathrm{CH}_{2}-\mathrm{CH}_{2}-\mathrm{Br} $

2-bromobutane $ \rightarrow $

( $ d $ and $ l $ form)

1-bromo-2-methyl propane $ \rightarrow $

2-bromo-2-methyl propane $ \rightarrow $

Chiral molecule have at least one carbon atom which is attached to 4 different atoms or groups and it does not have an element of symmetry.