Select which type of overlapping is responsible for `pi`-character in `Si-N` bond `H_(3)SiNCO`

Options

A. `3p pi to 2p pi`
B. `2p pito2p pi`
C. `3dpi larr 2p pi`
D. `3d pi larr 2d pi`

Answer

To determine the type of overlapping responsible for the pi character in the Si-N bond in H₃SiNCO, we can follow these steps:

### Step 1: Identify the Atoms Involved
In the molecule H₃SiNCO, we need to focus on the Si (silicon) and N (nitrogen) atoms.

### Step 2: Understand the Bonding
Silicon can form bonds using its available orbitals. In this case, we are interested in the bonding between silicon and nitrogen, particularly the pi character of the bond.

### Step 3: Analyze the Orbitals
- Silicon has empty 3d orbitals that can participate in bonding.
- Nitrogen has 2p orbitals that can also participate in bonding.

### Step 4: Determine the Type of Overlapping
The pi character in a bond arises from sideways overlapping of orbitals. In this case, the overlapping occurs between:
- 2p orbitals of nitrogen
- 3d orbitals of silicon

This overlapping is characterized as back bonding, where the 2p orbital of nitrogen overlaps sideways with the empty 3d orbital of silicon.

### Step 5: Conclude the Type of Overlapping
The type of overlapping responsible for the pi character in the Si-N bond is:
- **3d π and 2p π back bonding**.

Thus, the correct answer is that the pi character in the Si-N bond is due to the overlapping of 3d π and 2p π orbitals.