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Which one of the following has the most ...

Which one of the following has the most nucleophilic nitrogen ?

A

B

C

D

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The correct Answer is:
A
In option (b) lone pair of electrons on N is a part of aromaticity and in option (c ) `NH-` group is adjacent to to electron withdrawing group and in option (d) lone pair is a part of resonance. So pyridine is most nucleophilic.
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