Which of the following is not organometallic complex?

Options

A. Grignard reagent
B. Ferrocene
C. Trans-platin
D. Diethyl zinc

Answer

To determine which of the following is not an organometallic complex, we need to understand what constitutes an organometallic compound. An organometallic compound is defined as a compound that contains a metal (M) bonded to a carbon atom (C) through a covalent bond.

Let's analyze the given options step by step:

1. **Identify the Components**:
- Organometallic compounds typically consist of a metal and a carbon-containing group (like alkyl or aryl groups).

2. **Evaluate Each Option**:
- **Option 1: R-Mg-X (e.g., CH3-Mg-X)**:
- Here, Mg is the metal and it is bonded to a carbon atom (CH3). This is a sigma bond, making it an organometallic compound.
- **Option 2: Ferrocene**:
- Ferrocene consists of an iron (Fe) atom sandwiched between two cyclopentadienyl anions (C5H5). The bonding involves pi donation from the ligands to the metal, classifying it as a pi organometallic compound.
- **Option 3: Trans-platinum (trans-PtCl2(NH3)2)**:
- In this complex, platinum (Pt) is bonded to chlorine (Cl) and ammonia (NH3) but there is no carbon present in this structure. Therefore, it does not qualify as an organometallic compound.
- **Option 4: Diethyl zinc (C2H5)2Zn**:
- This compound contains zinc (Zn) bonded to two ethyl groups (C2H5). The bond between Zn and carbon makes it an organometallic compound.

3. **Conclusion**:
- After evaluating all the options, the only compound that does not contain a carbon atom bonded to the metal is **trans-platinum (trans-PtCl2(NH3)2)**. Therefore, this is the correct answer to the question.

### Final Answer:
**Trans-platinum (trans-PtCl2(NH3)2) is not an organometallic complex.**