Select the correct order of C-O bond order in mixed phosphine carbonyl complex :

[(P h_{3} P)_{3} M o (C O)_{3}] > [(P h_{2} P C l)_{3} M o (C O)_{3}] > (P h P C l_{2})_{3} M o (C O)_{3}]

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[(P h_{3} P)_{3} M o (C O)_{3}] > [(P h_{2} P C l)_{3} M o (C O)_{3}] < (P h P C l_{2})_{3} M o (C O)_{3}]

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[(P h_{3} P)_{3} M o (C O)_{3}] = [(P h_{2} P C l)_{3} M o (C O)_{3}] > (P h P C l_{2})_{3} M o (C O)_{3}]

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[(P h_{3} P)_{3} M o (C O)_{3}] < [(P h_{2} P C l)_{3} M o (C O)_{3}] > (P h P C l_{2})_{3} M o (C O)_{3}]

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Solution

The correct option is B $[(P h_{3} P)_{3} M o (C O)_{3}] > [(P h_{2} P C l)_{3} M o (C O)_{3}] < (P h P C l_{2})_{3} M o (C O)_{3}]$
As phenyl group increases, resonance increases and bond length increases so order is
$[(P h_{3} P)_{3} M o (C O)_{3}] > [(P h_{2} P C l)_{3} M o (C O)_{3}] < (P h P C l_{2})_{3} M o (C O)_{3}]$

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