Which of the following should be most volatile?

I.  \(\mathrm{CH}_3 \mathrm{CH}_2 \mathrm{CH}_2 \mathrm{NH}_2\)
II.  \(\left(\mathrm{CH}_3\right)_3 \mathrm{~N}\)
III. 
IV.  \(\mathrm{CH}_3 \mathrm{CH}_2 \mathrm{CH}_3\)

 

1. II 2. IV
3. I 4. III