Question

Which of the following should be most volatile?
I) `CH_3 CH_2 CH_2 NH_2" " II) " " (CH_3)_3 N " " III) " " " " IV) CH_3 CH_2 CH_3`
A. II
B. IV
C. I
D. III

Answer 1

Correct Answer - B
`1^(@)` and `2^(@)` amines have higher boiling points due to intermolecular H-bonding but less votaline than `3^(@)` amines and hydrocarbons of comparable molecular mass. Further, because of polar C-N bonds, `3^(@)` amines are more polar than hydrocarbons which are almost non-polar . hence , due to weak dipole -dipol interactions, `3^(@)` amines have higher boiling point (i.e. less volatile) than hydrocarbons. in other words, hydrocarbons are more volatile among given compounds as amine are less volatile than hydrocarbon