Select the statement which is NOT common between `H_(3)CNCO & H_(3)SiNCO`

Options

A. orbital involved in overlapping in `pi` bond of C-O bond
B. Orbital involved in overlapping in `pi` bond of N-C bond
C. Orbital involved in overlapping in `pi` bond of C-N bond and Si-N bond
D. Hybridisation of carbon which is bonded with oxygen

Answer

To solve the question of identifying the statement that is NOT common between the compounds H₃CNCO and H₃SiNCO, we will analyze each option step by step.

### Step 1: Understand the Structures of the Compounds
- **H₃CNCO**: This compound consists of a carbon (C) atom bonded to a nitrogen (N) atom, which is then double-bonded to an oxygen (O) atom. The structure can be represented as:
```
H
|
H - C - N = C = O
|
H
```
- **H₃SiNCO**: This compound has a silicon (Si) atom instead of carbon, but the rest of the structure is similar:
```
H
|
H - Si - N = C = O
|
H
```

### Step 2: Analyze Each Statement
1. **Statement 1**: Overlapping involved in the pi bond of CO bond is different.
- **Analysis**: The CO bond in both compounds involves the same type of bonding (double bond). Therefore, this statement is incorrect as they share this commonality.

2. **Statement 2**: Orbitals involved in the overlapping of pi bond between N and C.
- **Analysis**: In both compounds, there is a double bond between nitrogen and carbon (N=C). Thus, this statement is also incorrect as it indicates a commonality.

3. **Statement 3**: Orbitals involved in the overlapping of pi bond of CN and pi bond of SiN.
- **Analysis**: In H₃CNCO, there is a single bond between carbon and nitrogen (C-N), which means there is no pi bond present. In H₃SiNCO, there is also a single bond between silicon and nitrogen (Si-N). Therefore, this statement is correct as it highlights a difference; there is no pi bond in either case.

4. **Statement 4**: Hybridization of carbon which is bonded with the oxygen.
- **Analysis**: In H₃CNCO, the carbon bonded to oxygen is sp hybridized (due to two sigma bonds). In H₃SiNCO, the silicon bonded to oxygen is also sp hybridized. Therefore, this statement is incorrect as they share this commonality.

### Conclusion
The statement that is NOT common between H₃CNCO and H₃SiNCO is **Statement 3** regarding the pi bond between CN and SiN.

### Final Answer
**The statement which is NOT common between H₃CNCO and H₃SiNCO is: "Orbitals involved in the overlapping of pi bond of CN and pi bond of SiN."**