1.

In aqueous phase basicity of amines is in order NH_(3) lt (CH_(3))_(3)N lt CH_(3)NH_(2) lt (CH_(3))_(2)NH It is due to the following facts

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ammonium ions in solution are stabilised not only by alkyl GROUPS but also by HYDROGEN bond DONATION to the solvent.
Addition of the proton increases crowding and thus STRAIN set up which being highest in `3^(@)` amines decreases its basic character
both of the above
none of the above

Answer :C


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