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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

Answer»

II
IV
I
III

Solution :`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 polarthan hydrocarbons which are almost non-polar . hence , due to weak DIPOLE -dipol interactions, `3^(@)` amines have higher boilingpoint (i.e. less volatile) than hydrocarbons. in other words, hydrocarbons are more volatile among given compounds as amine are less volatile than hydrocarbon


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