Which of the following should be most volatile ?

Options

A. II
B. IV
C. I
D. III

Answer

B

Explanation

Among the isomeric amines, ter. amines have the lowest b.p. due to absence of intermolecular hydrogen bonding.
thus out of `CH_3 CH_2 CH_2 NH_2 ` .
and `(CH_3)_3N, (CH_3)_3 N` is the most volatile. However, due to polar nature of C-N bonds `(CH_3)_2 N` is more polar than `CH_3 CH_2 CH_3`. Therefore, due to weak dipole-dipole interactions, `(CH_3)_3 N` has higher boiling point or is less volatile than `CH_3 CH_2 CH_3`. Hence, `CH_3 CH_2 CH_3` is most volatile among the given compounds.