Single Choice

The correct increasing order of trans-effect of the following species is:

A$$Br^- > CN^- > NH_3 > {C_6 H_5}^-$$
B$$CN^- > Br^- > C_6H_5^- > NH_3$$
C$$NH_3 > CN^- > Br^- > {C_6 H_5}^-$$
D$$CN^- > {C_6 H_5}^- > Br^- > NH_3$$
Correct Answer

Solution

Trans effect can be defined as the effect of a ligand towards substitution on other ligand which is trans to it.

(weak) $$F^- < HO^- < H_2O < NH_3 < py < Cl^- < Br^- < I^-< SCN^-< NO_2^{-}< SC(NH_3)_2< Ph^-$$ < SO_3^{2-}< PR_3 < AsR_3< SR_2< H_3C^- < H^-< NO< CO< NC^-< C_2H_4 $$(strong).

Trans effect is nothing but those ligands which are trans directing. That means, which prefer a trans structure. Mostly in Square planar complexes.

Hence option D is correct.

SIMILAR QUESTIONS

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Coordination Compounds

What is the coordination entity formed when excess of aqueous KCN is added to an aqueous solution of copper sulphate? Why is it that no precipitate of copper sulphide is obtained when H2S(g) is passed through this solution?

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