Which of the following should be most volatile?

$\text{l)}{\mathrm{CH}}_3{\mathrm{CH}}_2{\mathrm{CH}}_2{\mathrm{NH}}_2$

$\text{II)}{\left({\mathrm{CH}}_3\right)}_3\mathrm{N}$

 

 

 

 

$\text{ IV) }{\mathrm{CH}}_3{\mathrm{CH}}_2{\mathrm{CH}}_3$

On comparison to amines, hydrocarbons have lower boiling point, hence they are more volatile whereas amines are having higher boiling point due to H-bonding.