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

CN > Br > C6H
5
> NH3
NH3 > CN > Br > C6H
5
CN > C6H
5
> Br > NH3
Br > CN > NH3 > C6H
5
Explanation:

Trans-effect: The intensity of trans-effect depend on increase in rate of substitution of the trans ligand. F < NH3 < Cl < Br < Ph < CH3 < CN

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