Select the correct order of $\mathrm{C}$-O bond order in mixed phosphine carbonyl complex: I.…

Select the correct order of $\mathrm{C}$-O bond order in mixed phosphine carbonyl complex: I. $\left[\mathrm{Mo}\left(\mathrm{Ph}_{3} \mathrm{P}ight)_{3}(\mathrm{CO})_{3}ight]$ II. $\left[\mathrm{Mo}\left(\mathrm{Ph}_{2} \mathrm{PCl}ight)_{3}(\mathrm{CO})_{3}ight]$ III. $\left[\mathrm{Mo}\left(\mathrm{PhPCl}_{2}ight)_{3}(\mathrm{CO})_{3}ight]$
  1. $\mathrm{I}>\mathrm{II}>\mathrm{III}$
  2. I $ > \mathrm{II} < \mathrm{III}$
  3. $\mathrm{I}=\mathrm{II}>\mathrm{III}$
  4. I $ < $ II $>$ III

Solution

As phenyl group increases, resonance increases and bond length increases so order is $\left.\left[\left(\mathrm{P} \mathrm{h}_{3} \mathrm{P}ight)_{3} \mathrm{Mo}(\mathrm{CO})_{3}ight]>\left[\left(\mathrm{P} \mathrm{h}_{2} \mathrm{P} \mathrm{Cl}ight)_{3} \mathrm{Mo}(\mathrm{CO})_{3}ight] > \left[(\mathrm{P} \mathrm{hP} \mathrm{Cl}_{2}ight)_{3} \mathrm{Mo}(\mathrm{CO})_{3}ight]$ ,

Asked in: JEE-TOPICTESTS-CHEMISTRY

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