whereas in aqueous solution 
Why?
Answer:
In gaseous
phase there is no hydrogen bonding so, only inductive effect decides basic
strength. Since, in 3° amine there are three electron releasing groups. So, 3°
amine is most basic and then 2° and 1°.
But in aqueous
solution basic strength is governed by H-bonding also. The more H-bond is
formed by an amine the more it is basic. These two effect are opposite to each other.
Thus in
aqueous solution order of basicity 2° > 3° > 1°.
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