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JEE Main Online Paper (Held On 19 May 2012)
A) \[IV>I>III>II\]
B) \[I>III>II>IV\]
C) \[III>I>IV>II\]
D) \[II>I>III>IV\]
Correct Answer: B
Solution :
The order of basicity is I > III > II > IV The lone pair of electrons on N is more readily available for protonation in I and III then in II. Ill contains an oxygen atom which has - I effect due to which it is less basic than I. In compound IV lone pair of \[{{e}^{-}}s\] on N-atom is contributed towards the aromatic sextet formation and hence is not at all available for protonation. Hence option (b) is correct.
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