The correct order of increasing basic nature for the bases NH3, CH3NH2 and (CH3)2NH in aqueous solutions

(CH 3 ) 2 NH < NH 3 < CH 3 NH 2

(CH 3 ) 2 NH < NH 3 < CH 3 NH 2

CH 3 NH 2 < NH 3 < (CH 3 ) 2 NH

(CH 3 ) 2 NH < NH 3 < CH 3 NH 2

NH 3 < CH 3 NH 2 < (CH 3 ) 2 NH

CH 3 NH 2 < (CH 3 ) 2 NH < NH 3

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The correct order of increasing basic nature for the bases NH₃, CH₃NH₂ and (CH₃)₂NH in aqueous solutions

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CH₃NH₂ < NH₃ < (CH₃)₂NH

(CH₃)₂NH < NH₃ < CH₃NH₂

NH₃ < CH₃NH₂ < (CH₃)₂NH

CH₃NH₂ < (CH₃)₂NH < NH₃

answer is B.

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Due to electron releasing nature, the alkyl group (R) pushes electrons towards nitrogen in alkyl amine and thus, makes the unshared electron pair more available for sharing with the proton of the acid.
Therefore, alkyl amines are more basic than ammonia.
The alkyl groups donate electrons to the nitrogen atom by +I effect.
Among amines, secondary amines are more basic than primary amines because, in secondary amines, there are more alkyl groups.
So, there is more electron density on nitrogen atom as compared to primary amine.

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