The order of basic character is:
I 
II 
III 
IV
III 
I 
II 
I 
III 
IV
I 
II 
III
Text Solution
Verified by ExpertsB
The basicity of the compound depends on the availability of the lone pairs.
In compound IV, Nitrogen is 
hybridized.
In compound III, Nitrogen is 
hybridized and the lone pairs are not involved in resonance.
In compound I, Nitrogen is 
hybridized and the lone pairs are involved in resonance.
In compound II, Nitrogen is 
hybridized and the lone pairs are involved in resonance such that, they are contributing to the aromaticity of the ring.
From the above points we can conclude that the basicity order should be IV > III > I > II.
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