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Chemistry Question on Amines

The correct order of the basic strength of methyl substituted amines in aqueous solution is :

A

(CH3)3N>(CH3)2NH>CH3NH2(CH_3)_3N > (CH_3)_2NH > CH_3NH_2

B

CH3NH2>(CH3)2NH>(CH3)3NCH_3NH_2> (CH_3)2NH > (CH_3)_3N

C

(CH3)2NH>CH3NH2>(CH3)3N(CH_3)_2NH > CH_3NH_2 > (CH_3)_3N

D

(CH3)3N>CH3NH2>(CH3)2NH(CH_3)_3N > CH_3NH_2> (CH_3)_2NH

Answer

(CH3)2NH>CH3NH2>(CH3)3N(CH_3)_2NH > CH_3NH_2 > (CH_3)_3N

Explanation

Solution

In aqueous solution, electron donating inductive effect, solvation effect (H-bonding) and steric hindrance all together affect basic strength of substituted amines Basic character :
{ \underset{{ 2^{\circ}}}{{ (CH_3)_2NH }}>>\underset{{ 1^{\circ}}}{{CH_3NH_2 }}>>\underset{{ 3^{\circ}}}{{ (CH_3)_3N}} }