Arrange the following in the increasing order of their basic strengths :
Text Solution
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: Among the given compounds, 
is the weakest base.
Methyl amines are stronger bases than 
due to the 
effect of 
group. Thus greater the number of methyl groups, more will be the basicity of the amine due to greater availability of electron density on nitrogen. Thus, the expected order is :
.
However, in tertiary amines, crowding of alkyl groups covers nitrogen atom from all sides making the approach and bonding by 
relatively difficult, thus the electrons are there but the path is blocked resulting in reduced basicity, thus the order of increasing basicity is :
.
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