The number of bridging $CO$ ligand (s) and $Co - Co$ bond (s) in $ {CO_2(CO)_8}$, respectively are :

Question

Sum of oxidation state (magnitude) and coordination number of cobalt in $Na[Co(bpy)Cl_4]$ is____ .
(Given : bpy =

)

Answer 1

To determine the number of bridging $ \text{CO} $ ligands and $ \text{Co} - \text{Co} $ bonds in $ \text{Co}_2(\text{CO})_8 $, we need to examine the structure of this compound in detail.

The compound $ \text{Co}_2(\text{CO})_8 $ is a well-known complex with two cobalt atoms bonded together. Here's how the structure breaks down:

Each cobalt atom is coordinated to four carbon monoxide ligands.
Out of the eight $ \text{CO} $ ligands in the entire molecule, four are terminal (each attached to a single cobalt atom), while the remaining four can be analyzed for bridging position.
In the actual cluster structure of the compound $ \text{Co}_2(\text{CO})_8 $, it is known that two of the carbon monoxide ligands act as bridges between the two cobalt atoms.
These two bridging ligands mean that there are two $ \text{CO} $ ligands connected to both cobalt atoms.
This structural arrangement leaves us with one $ \text{Co} - \text{Co} $ bond holding the cobalt atoms together directly.

Thus, in $ \text{Co}_2(\text{CO})_8 $:

There are 2 bridging $ \text{CO} $ ligands.
There is 1 $ \text{Co} - \text{Co} $ bond.

The correct answer is therefore: 2 \text{ and } 1. This matches with the option "2 and 1".

Justification of other options:

The option "0 and 2" is incorrect because we have established that there are 2 bridging $ \text{CO} $ ligands and not 0.
The option "2 and 0" is incorrect because there is indeed a $ \text{Co} - \text{Co} $ bond present.
The option "4 and 0" is incorrect because only 2 of the $ \text{CO} $ ligands are bridging, and there exists one $ \text{Co} - \text{Co} $ bond.

Answer 2

To determine the number of bridging $ \text{CO} $ ligands and $ \text{Co} - \text{Co} $ bonds in $ \text{Co}_2(\text{CO})_8 $, we need to examine the structure of this compound in detail.

The compound $ \text{Co}_2(\text{CO})_8 $ is a well-known complex with two cobalt atoms bonded together. Here's how the structure breaks down:

Each cobalt atom is coordinated to four carbon monoxide ligands.
Out of the eight $ \text{CO} $ ligands in the entire molecule, four are terminal (each attached to a single cobalt atom), while the remaining four can be analyzed for bridging position.
In the actual cluster structure of the compound $ \text{Co}_2(\text{CO})_8 $, it is known that two of the carbon monoxide ligands act as bridges between the two cobalt atoms.
These two bridging ligands mean that there are two $ \text{CO} $ ligands connected to both cobalt atoms.
This structural arrangement leaves us with one $ \text{Co} - \text{Co} $ bond holding the cobalt atoms together directly.

Thus, in $ \text{Co}_2(\text{CO})_8 $:

There are 2 bridging $ \text{CO} $ ligands.
There is 1 $ \text{Co} - \text{Co} $ bond.

The correct answer is therefore: 2 \text{ and } 1. This matches with the option "2 and 1".

Justification of other options:

The option "0 and 2" is incorrect because we have established that there are 2 bridging $ \text{CO} $ ligands and not 0.
The option "2 and 0" is incorrect because there is indeed a $ \text{Co} - \text{Co} $ bond present.
The option "4 and 0" is incorrect because only 2 of the $ \text{CO} $ ligands are bridging, and there exists one $ \text{Co} - \text{Co} $ bond.

The number of bridging $CO$ ligand (s) and $Co - Co$ bond (s) in $ {CO_2(CO)_8}$, respectively are :

The Correct Option is D

Solution and Explanation

Top Questions on Werner’s Theory of Coordination Compounds

Questions Asked in JEE Main exam