Question

Among the ligands $N{H}_3,en,C{N}^{-}$ and $CO$, the correct order of their increasing field strength is?

• A. $N{H}_3<en<C{N}^{-}<CO$
• B. $C{N}^{-}<N{H}_3<CO<en$
• C. $en<C{N}^{-}<N{H}_3<CO$
• D. $CO<N{H}_3<en<C{N}^{-}$

Answer 1

Answer: (A)

$N{H}_3<en<C{N}^{-}<CO$

Increasing order of field strength is $N{H}_3<en<C{N}^{-}<CO$.

In general, field strength order is Halogen family $<$ Oxygen family $<$ Nitrogen family $<$ Carbon family.