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Q.
Among the following substituted pyridines, the most basic compound is
KVPYKVPY 2012
Solution:
Pyridine is basic in nature due to the presence of free lone pair. Its basicity gets affected by the presence of different substituents attached to it. The electron withdrawing group decreases the basicity of pyridine, whereas electron releasing groups increases its basicity.
Substituents like $N ( Me )_{2}$ and $CH _{3}$ are electron releasing but $N ( Me )_{2}$ is more activating group than $CH _{3}$.
So
basicity would be maximum while $Cl$ is an electron withdrawing group, so
is basicity would be least.
The increasing order of basicity of compounds given in options will be
