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

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Among these compounds the correct order of C-N bond length is :
A. `IVgtIgtIIgtIII`
B. `IIIgtIgtIIgtIV`
C. `IIIgtIIgtIgtIV`
D. `IIIgtIgtIVgtII`
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Correct Answer - C
C-N bond 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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