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Consider the following complex entities containing different ligands in the anti-position:
$I : [C r {(C O)}_{6}] I I : [C r {(C O)}_{3} {(P F_{3})}_{3}] I I I : [C r (d i e n) {(C O)}_{3}]$
The correct order of $C - O$ bond length is :

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$I > I I > I I I$

$I < I I I < I I$

$I < I I < I I I$

$I I < I < I I I$

answer is C.

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Detailed Solution

$π$ - accepting ability follows the order : dien $< C O < P F_{3}$ As back - donation increases , $C O$ – bond length increases.

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