The correct order of the basic strength of methyl substitited ami… - Vidyadip

MCQ

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

✓
$ \left(\mathrm{CH}_3\right)_2 \mathrm{NH}>\mathrm{CH}_3 \mathrm{NH}_2>\left(\mathrm{CH}_3\right)_3 \mathrm{N} $
B
$ \left(\mathrm{CH}_3\right)_3 \mathrm{N}>\mathrm{CH}_3 \mathrm{NH}_2>\left(\mathrm{CH}_3\right)_2 \mathrm{NH} $
C
$ \left(\mathrm{CH}_3\right)_3 \mathrm{N}>\left(\mathrm{CH}_3\right)_2 \mathrm{NH}>\mathrm{CH}_3 \mathrm{NH}_2 $
D
$ \mathrm{CH}_3 \mathrm{NH}_2>\left(\mathrm{CH}_3\right)_2 \mathrm{NH}>\left(\mathrm{CH}_3\right)_3 \mathrm{N} $

✓

Answer

Correct option: A.

$ \left(\mathrm{CH}_3\right)_2 \mathrm{NH}>\mathrm{CH}_3 \mathrm{NH}_2>\left(\mathrm{CH}_3\right)_3 \mathrm{N} $

In aqueous solution, electron donating inductive effect, solvation effect $(H-$bonding$)$ and steric hindrance all together affect basic strength of substituted amines.
Basic character:
$(\text{CH}_3)_2\text{NH}>\text{CH}_3\text{NH}_2>(\text{CH}_3)_3\text{N}\\ \ \ \ \ \ \ \ \ \ 2^\circ\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ 1^\circ\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ 3^\circ$

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