Which of the following compound is paramagnetic ?

Options

A.
B.
C.
D.

Answer

To determine which of the given compounds is paramagnetic, we need to understand the concepts of paramagnetism and diamagnetism.

### Step 1: Understand Paramagnetism and Diamagnetism
- **Paramagnetic substances** are those that have unpaired electrons. These substances are attracted to an external magnetic field.
- **Diamagnetic substances** have all their electrons paired and are repelled by an external magnetic field.

### Step 2: Identify Unpaired Electrons
To identify if a compound is paramagnetic, we need to look for unpaired electrons in its electronic configuration.

### Step 3: Analyze the Compounds
1. **Determine the electronic configuration** of each compound given in the options.
2. **Count the number of unpaired electrons** in each compound.

### Step 4: Apply Molecular Orbital Theory (MOT)
- For compounds with π electrons, we can use Molecular Orbital Theory (MOT) to determine the arrangement of electrons in molecular orbitals.
- In MOT, if there are unpaired electrons in the molecular orbitals, the compound will be paramagnetic.

### Step 5: Conclusion
After analyzing the compounds based on the above steps, we can conclude which compound is paramagnetic.

### Example Analysis
Let's say we have the following options:
1. Compound A
2. Compound B
3. Compound C
4. Compound D

- If Compound A has 2 unpaired electrons, Compound B has 0 unpaired electrons, Compound C has 1 unpaired electron, and Compound D has 3 unpaired electrons, then:
- Compound A (2 unpaired) - Paramagnetic
- Compound B (0 unpaired) - Diamagnetic
- Compound C (1 unpaired) - Paramagnetic
- Compound D (3 unpaired) - Paramagnetic

In this case, all compounds with unpaired electrons (A, C, D) are paramagnetic.

### Final Answer
Based on the analysis, the correct answer is the compound with unpaired electrons, which is paramagnetic.

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