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Among these compounds the correct order of C-N bond length is :

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$III > II > I > IV$

$IV > I > II > III$

$III > I > II > IV$

$III > I > IV > II$

answer is C.

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Detailed Solution

C- Nbond in (III) is pure single bond so bond length is maximum.
C-N bond in (IV) is pure double bond while in case of (I) and (II) resonance occur so single bond get converted in double bond.

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