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

1. (CH3)2NH > CH3NH2 > (CH3)3N
2. (CH3)3N > CH3NH2 > (CH3)2NH
3. (CH3)3N > (CH3)2NH > CH3NH2
4. CH3NH2 > (CH3)2NH > (CH3)3N

Correct answer: (CH3)2NH > CH3NH2 > (CH3)3N

Solution

In aqueous solution, the basic strength of amines depends on both inductive effects and solvation. Secondary amines like (CH3)2NH are more basic than primary amines (CH3NH2) due to stronger inductive effects and better solvation. Tertiary amines ((CH3)3N) are less basic due to steric hindrance reducing solvation.

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