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Question

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


Solution

The correct option is B CN>C6H5>Br>NH3
Trans effect is the effect of a coordinated group upon the rate of substitution at the position trans to itself in a square or octahedral complex. As the rate of substitution of the trans ligand increases, the intensity of trans effect also increases. Thus, correct order is,
CN>C6H5>Br>NH3

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