`[Co(NH_(3))_(5)NO_(2)]Cl_(2) and [Co(NH_(3))_(5)ONO]Cl_(2)`
are related to each other as :-

Options

A. Geometrical isomers
B. Linkage isomers
C. Coordination isomers
D. ionisation isomers

Answer

To solve the problem, we need to analyze the two coordination complexes given: \([Co(NH_3)_5NO_2]Cl_2\) and \([Co(NH_3)_5ONO]Cl_2\).

### Step 1: Identify the ligands in both complexes
- In the first complex \([Co(NH_3)_5NO_2]Cl_2\), the ligand \(NO_2^-\) is present.
- In the second complex \([Co(NH_3)_5ONO]Cl_2\), the ligand \(ONO^-\) is present.

### Step 2: Determine how the ligands are bonded
- In \([Co(NH_3)_5NO_2]Cl_2\), the \(NO_2^-\) ligand is bonded to the cobalt through the nitrogen atom, forming a nitro complex.
- In \([Co(NH_3)_5ONO]Cl_2\), the \(ONO^-\) ligand is bonded to the cobalt through the oxygen atom, forming a nitrito complex.

### Step 3: Understand the concept of linkage isomerism
- Linkage isomerism occurs when a ligand can coordinate to a metal through different atoms. In this case, the \(NO_2^-\) ligand can bond through either nitrogen or oxygen, leading to two different isomers.

### Step 4: Conclude the relationship between the two complexes
- Since the two complexes differ only in the donor atom of the \(NO_2^-\) ligand (one is bonded through nitrogen and the other through oxygen), they are classified as linkage isomers.

### Final Answer
The two complexes \([Co(NH_3)_5NO_2]Cl_2\) and \([Co(NH_3)_5ONO]Cl_2\) are related to each other as **linkage isomers**.

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