NEET Chemistry NEET PYQ-Coordination Chemistry

Which of the following is the correct order of increasing field strength of ligands to form coordination compounds? [NEET 2020]

A) \[SC{{N}^{-}}<{{F}^{-}}<C{{N}^{-}}<{{C}_{2}}O_{4}^{2-}\]

B) \[{{F}^{-}}<SC{{N}^{-}}<{{C}_{2}}O_{4}^{2-}<C{{N}^{-}}\]

C) \[C{{N}^{-}}<{{C}_{2}}O_{4}^{2-}<SC{{N}^{-}}<{{F}^{-}}\]

D) \[SC{{N}^{-}}<{{F}^{-}}<{{C}_{2}}O_{4}^{2-}<C{{N}^{-}}\]

Correct Answer: D

Solution :

[d] Spectrochemical series (as given in NCERT):

\[{{l}^{-}}<B{{r}^{-}}<SC{{N}^{O-}}<C{{l}^{-}}<{{S}^{2-}}<{{F}^{-}}<\overline{O}H<\]

\[{{C}_{2}}O_{4}^{2-}<{{H}_{2}}O<NC{{S}^{O-}}<EDT{{A}^{4-}}<N{{H}_{3}}\]\[<en<\overset{O-}{\mathop{C}}\,<CO\]