Answer:
(b)
1° and 2° Amines due to intermolecular H-bonding have higher boiling points
(and hence less volatile than 3° amines and hydrocarbons of comparable
molecular mass. Further, due to polar C-N bonds, 3° amines are more polar than
hydrocarbons which are almost non-polar. Therefore, due to weak dipole- dipole
interactions, 3° amines have higher boiling point (i.e., less volatile) than
hydrocarbons. In other words, has the
least b.p. and hence is most volatile.
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