Question 463 of 512

The correct increasing order of trans-effect of the following species is
 
(a) NH3 > CN- > Br- > C6H5-
 
(b) CN- >  C6H5- > Br- > NH3
 
(c) Br- > CN- >NH> C6H5-
 
(d) CN- > Br- >C6H5- >NH3