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Chemistry Question on coordination compounds

Which of the following is correct order of ligand field strength?

A

S2−<NH3<S ^{2-}< NH _3< en <CO<C2O42< CO < C _2 O _4^2

B

NH3<en<CO<S2−<C2O42NH _3< en < CO < S ^{2-}< C _2 O _4^2

C

CO<CO < en <NH3<C2O42<S2−< NH _3< C _2 O _4^2< S ^{2-}

D

S2−<C2O42<NH3<en<COS ^{2-}< C _2 O _4^2< NH _3< en < CO

Answer

S2−<C2O42<NH3<en<COS ^{2-}< C _2 O _4^2< NH _3< en < CO

Explanation

Solution

The increasing order of field strength of ligands (according to spectrochemical series)
S2−<C2​O42−​<NH3​<en<CO