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

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${CH}_{3} {NH}_{2} > {({CH}_{3})}_{2} NH > {({CH}_{3})}_{3} N$

${({CH}_{3})}_{2} NH > {CH}_{3} {NH}_{2} > {({CH}_{3})}_{3} N$

${({CH}_{3})}_{3} N > {CH}_{3} {NH}_{2} > {({CH}_{3})}_{2} NH$

${({CH}_{3})}_{3} N > {({CH}_{3})}_{2} NH > {CH}_{3} {NH}_{2}$

answer is B.

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Detailed Solution

Basicity of amines in aqueous solution depends on combined influence effect of inductive effect, solvent effect, and steric effect.

R₂NH > R-NH₂ ..........I-effect > solvent effect.
R₂NH > R₃N .......... solvent effect > I- effect
R-NH₂ > R₃N .......... solvent effect > I- effect

If R = CH₃, basic strength is

${({CH}_{3})}_{2} NH > {CH}_{3} {NH}_{2} > {({CH}_{3})}_{3} N$

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