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The correct increasing order of trans-effect of the following species is:
a. \( \mathrm{NH}_{3}>\mathrm{CN}^{-}>\mathrm{Br}^{-}>\mathrm{C}_{6} \mathrm{H}_{5}^{-} \)
b. \( \mathrm{CN}^{-}>\mathrm{C}_{6} \mathrm{H}_{5}^{-}>\mathrm{Br}^{-}>\mathrm{NH}_{3} \)
c. \( \mathrm{Br}^{-}>\mathrm{CN}^{-}>\mathrm{NH}_{3}>\mathrm{C}_{6} \mathrm{H}_{5}^{-} \)
d. \( \mathrm{CN}^{-}>\mathrm{Br}^{-}>\mathrm{C}_{6} \mathrm{H}_{5}^{-}>\mathrm{NH}_{3} \)
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