MCQ
In $Fe_2(CO)_9$, the two iron atoms are
- Alinked only directly
- ✓linked directly along with $3\,CO$ molecules as bridging ligands
- Clinked only through $3\,CO$ molecules as bridging ligands
- Djoined through one $CO$ group as bridging ligands

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| Run | $[A]/mol\,L^{-1}$ | $[B]/mol\,L^{-1}$ | Initial rate of formation of $D/mol\,L^{-1}\,min^{-1}$ |
| $I.$ | $0.1$ | $0.1$ | $6.0 \times 10^{-3}$ |
| $II.$ | $0.3$ | $0.2$ | $7.2 \times 10^{-2}$ |
| $III.$ | $0.3$ | $0.4$ | $2.88 \times 10^{-1}$ |
| $IV.$ | $0.4$ | $0.1$ | $2.40 \times 10^{-2}$ |
Based on the above data which one of the following is correct?