JEE MAIN - Chemistry (2003 - No. 18)
The correct order of increasing basic nature for the bases NH3, CH3NH2 and (CH3)2 NH is
(CH3)2NH < NH3 < CH3NH2
NH3 < CH3NH2 < (CH3)2NH
CH3NH2 < (CH3)2NH < NH3
CH3NH2 < NH3 < (CH3)2NH
설명
The alkyl groups are electron releasing group $$\left( { + {\rm I}} \right),$$ thus increases the electron density around the nitrogen thereby increasing the availability of the lone pair of electrons to proton or lewis acid and making the amine more basic. Hence more the no. of alkyl group more basic is the amine. Therefore the correct order is $$N{H_3} < C{H_3}N{H_2} < {\left( {C{H_3}} \right)_2}N$$