Trans effect

2016 Phase II 1 question

1. 1 Coordination Compounds
   The correct increasing order of trans-effect of the following species is:
   A $Br^- > CN^- > NH_3 > C_6H_5^-$ B $CN^- > Br^- > C_6H_5^- > NH_3$ C $NH_3 > CN^- > Br^- > C_6H_5^-$ D $CN^- > C_6H_5^- > Br^- > NH_3$
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