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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
$CN^- > C_6H_5^- > Br^- > NH_3$
Explanation
Strong π-acceptor/σ-donor ligands like $CN^-$ have the largest trans effect.
Detailed Solution
Trans effect order: $CN^- > C_6H_5^- > Br^- > NH_3$