Arrange the following in correct sequence of basic strength.
I 
III 
II
I 
II 
IV
I 
III 
IV
III 
II 
IV
Text Solution
Verified by ExpertsD
Piperidine (I) and morpholine (III) both are non-aromatic and 
-atom is 
-hybridised in them, so these are more basic as compared to other two (which are aromatic and have 
-hybridised 
-atom). -I-effect of oxygen-atom in morpholine makes it less basic as compared to piperidine. Now, out of pyridine (II) and pyrrole (IV), pyridine is much stronger base as the lone pair of nitrogen atom in pyridine is not involved in resonance. So, the order of basic strength is
I 
III 
II 
IV.
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