For the reaction of trans- [IrX(CO)(PPh₃)₂] (X=F, Cl, Br, I) with O₂, correct order of variation of rate with… · ABC26IN1484

Subject: Inorganic Chemistry · Chapter: Organometallic Compounds · Topic: Organometallic Compounds – General · Exam: CSIR NET JUNE 2019 · Marks: 2 · Difficulty: Hard

For the reaction of trans-$\left[\mathrm{IrX(CO)(PPh_3)_2}\right]$ ($\mathrm{X=F, Cl, Br, I}$) with $\mathrm{O_2}$, correct order of variation of rate with X is

(a)$\mathrm{Br}>\mathrm{I}>\mathrm{F}>\mathrm{Cl}$

(b)$\mathrm{F}>\mathrm{Cl}>\mathrm{Br}>\mathrm{I}$

(c)$\mathrm{F} \approx \mathrm{Cl} \approx \mathrm{Br} \approx \mathrm{I}$

(d)I $>$ Br $>$ Cl $>$ F

Answer

Answer: D ✓ checked by 4AB · confidence high

Explanation

Oxidative addition of O₂ to Vaska-type complexes is faster the more electron-rich the metal; the softer, better donor halide gives the higher rate: I > Br > Cl > F.

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