The correct order of $C - N$ bond length in the given compounds is :
$P : C H_{3} C N Q : H N C O R : C H_{3} C O N H_{2}$

P > Q > R

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P = Q = R

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R > Q > P

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R > P > Q

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Solution

The correct option is D $R > Q > P$
obviously,
bond length order is triple bond<double bond<single bond
in option P,triple bond is present
in option Q,double bond is present
in option R,single bond is present

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