Question

Which of the following is the correct order of increasing field strength of ligands to form coordination compounds ?

• A. $SC{N}^{-}<F^{-}<C{N}^{-}<C_2{O}_4^{2-}$
• B. $F^{-}<SC{N}^{-}<C_2{O}_4^{2-}<C{N}^{-}$
• C. $SC{N}^{-}<F^{-}<C_2{O}_4^{-}<C{N}^{-}$
• D. $C{N}^{-}<C_2{O}_4^{2-}<SC{N}^{-}{F}^{-}$

Answer 1

The correct option is C $SC{N}^{-}<F^{-}<C_2{O}_4^{-}<C{N}^{-}$

Ligands can be arranged in a series of increasing ​field strength known as spectrochemical series.

Spectrochemical series:​
$I^{-}<B{r}^{-}<SC{N}^{-}<C{l}^{-}<S^{2-}<F^{-}<\stackrel{-}{O}H<C_2{O}_4^{2-}<H_{2}O<NC{S}^{-}<EDT{A}^{4-}<N{H}_3<en<C{N}^{-}<CO$

Hence, option (d) is correct.