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Question

The correct increasing order of trans-effect of the following species is :
  1. CN>Br>C6H5>NH3
  2. Br>CN>NH3>C6H5
  3. CN>C6H5>Br>C6H5
  4. NH3>CN>Br>C6H5


Solution

The correct option is C CN>C6H5>Br>C6H5
Trans effect order CN>C6H5>Br>NH3
 

Trans effect can be defined as the effect of a ligand towards substitution on other ligand which is trans to it. Those ligands which are trans directing, that means, which prefer a trans structure, mostly in Square planar complexes. The intensity of the trans-effect as measured by the increase in rate of substitution of the trans ligand.

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