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

  • A
    $NH_3 < CN^{-} < Br^{-} < C_6H_5^{-}$
  • B
    $NH_3 < Br^{-} < C_6H_5^{-} < CN^{-}$
  • C
    $Br^{-} < CN^{-} < NH_3 < C_6H_5^{-}$
  • D
    $CN^{-} < Br^{-} < C_6H_5^{-} < NH_3$

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