Among the ligands $\mathrm{NH_3}$, en, $\mathrm{CN^-}$ and CO the correct order of their increasing field strength, is;
- A$\mathrm{NH_3 < en < CN^- < CO}$
- B$\mathrm{CN^- < NH_3 < CO < en}$
- C$\mathrm{en < CN^- < NH_3 < CO}$
- D$\mathrm{CO < NH_3 < en < CN^-}$
✓ Correct answer: A
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