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

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NH3>CN->Br->C6H5-

CN->C6H5->Br->NH3

Br->CN->NH3>C6H5-

CN->Br->C6H5->NH3

answer is B.

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Detailed Solution

The intensity of the trans-effect as measured by the increase in rate of substitution of the trans ligand follows the sequence:CN->C6H5->Br->NH3

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