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

I V > I > I I > I I I

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I I I > I > I I > I V

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I I I > I I > I > I V

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I I I > I > I V > I I

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Solution

The correct option is D $I I I > I I > I > I V$
As a result of resonance there will be no formation of the double bond between $C - N$ . Therefore, bond length will increase from $(i v)$ to $(i)$ then to $(i i)$ & then to $(i i i)$ .

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

The correct option is D III>II>I>IVAs a result of resonance there will be no formation of the double bond between C−N. Therefore, bond length will increase from (iv) to (i) then to (ii) & then to (iii).

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

The correct option is D $I I I > I I > I > I V$
As a result of resonance there will be no formation of the double bond between $C - N$ . Therefore, bond length will increase from $(i v)$ to $(i)$ then to $(i i)$ & then to $(i i i)$ .