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Among O-nitro aniline(I),P-nitro aniline (II),M-nitro aniline (III) the order of increasing basic strength is

$\begin{array}{1 1}(a)\;(I) < (II) < (II)&(b)\;(II) < (I) < (III)\\(c)\;(III) < (I) < (II)&(d)\;(I) < (II) < (III)\end{array}$

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$-NO_2$ group is $e^{\ominus}$-with drawing by induction from all positions but mainly by extended bonding from +ve ortho and para positions.Hence para isomer is less basic than meta isomer.Hence the correct order is
M-nitro aniline > P-nitroaniline > O-nitro aniline
Hence (d) is the correct answer.
answered Feb 27, 2014 by sreemathi.v

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