Choose the incorrect match :

Options

A. `K[PtCl_(3)(C_(2)H_(4))]` : Zeise's salt
B. `Fe(CO)_(5)` : Trigonal bipyramidal
C. `[Co(NH_(3))_(6)]^(3+)` : Inner orbital complex
D. `[Cr(NH_(3))_(6)]^(3+)` : Diamagnetic

Answer

To solve the question "Choose the incorrect match," we will analyze each option provided in the question step by step.

### Step-by-Step Solution:

1. **Identify the Compounds and Their Descriptions**:
- The question presents several compounds and their corresponding descriptions. We need to evaluate if the descriptions match the compounds correctly.

2. **Evaluate Each Compound**:
- **KEtCl3C2H4**: This compound is described as a Z-salt and is an organometallic compound. The description seems accurate as it relates to organometallic chemistry.
- **Fe(CO)5**: The geometry is stated as trigonal bipyramidal. The oxidation state of Fe in this compound is zero, and CO is a strong field ligand causing pairing of electrons. The hybridization is indeed DSP3, leading to a trigonal bipyramidal shape. This description is correct.
- **Cobalt Complex with 6 Ammonia**: The oxidation state of cobalt is +3, and it is paired with ammonia, a strong field ligand. The description mentions that it forms an inner orbital complex, which is correct as it uses the inner d-orbitals due to pairing.
- **Chromium Complex**: The oxidation state of chromium is +3, leading to a configuration of 3d3. The statement claims it is diamagnetic, but since there are three unpaired electrons, it should be paramagnetic. This statement is incorrect.

3. **Conclusion**:
- The incorrect match is the statement regarding the chromium complex, which incorrectly states that it is diamagnetic when it is actually paramagnetic.

### Final Answer:
The incorrect match is the statement about the chromium complex, which is described as diamagnetic.

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