Which of the following statement is/are correct ?
I . The ligand thiosulphate , `S_(2)O_(3)^(2-)` can give rise to linkage isomers .
II. In metallic carbonyls the ligand CO molecule acts both as donor and acceptor .
III. The complex `[Pt(Py)(NH_(3))(NO_(2))ClBrI]` exists in eight different geometrical isomeric forms .
IV. The complex ferricyanide ion does not follow effective atomic number (EAN) rule .

Options

A. I and II only
B. II and IV only
C. I , II and III
D. I , II and IV

Answer

D

Explanation

As `[Pt(Py)(Nh_(3))(NO_(2))ClBr]` exists in 15 different geometrical isomers, each of which would also have an optical isomer so it is incorrect.