What is the coordination number of Co in `[Co(NH_(3))_(4)(H_(2)O)Br](NO_(3))_(2)`?

Options

A. FTTF
B. TTTT
C. FTTF
D. TTTF

Explanation

`(C^(**)),S_(1):` Pentamminethiocyanato-N-chrominium (III) tetrachlorozincate (II). Or PenPentamminethiocyanatochrominium (III) tetrachlorozincate (II)
`S_(2): In CoSO_(4)`, the oxidation state of Co is i.e. `"["Ar"]"^(18)3d^(7)4s^(0)` electron configuration. It has two unpaired electrons so it is parmagnetic and coloured.
`S_(3):"["Co(NH_(3))_(4)(NO_(2))_(2)"]"NO_(3)`
`"["Co(NH_(3))_(4)(NO_(2))(NO_(3))"]"NO_(2)`
isomerism
`S_(3):"["Co(NH_(3))_(4)(NO_(2))_(2)"]"NO_(3)`
`"["Co(NH_(3))_(4)(NO_(2))(oNO_(3))"]"NO_(3)`
isomerism
The complex has cis- and trans isomers.
Total isomers=10.
`S_(4)`: The bond length C-O in CO itself is 1.128, while the bond length in `"["Fe(CO)_(5)"]"` molecules are `1.15Å` and account of synergic interaction beteween Fe and CO.