In the structure of diborane,

Options

A. all hydrogen lie in one plane and boron atoms lie in a plane perpendicular to this plane
B. 2 boron atoms and 4 terminal hydrogen atoms lie in the perpendicular plane
C. 4 bridging hydrogen atoms and boron atoms lie in one plane and two terminal hydrogen atoms lie in a plane perpendicular to this plane
D. all the atoms are in the same plane.

Answer

To solve the question regarding the structure of diborane (B2H6), we will analyze the arrangement of the atoms in the molecule step by step.

### Step-by-Step Solution:

1. **Understanding the Composition of Diborane**:
- Diborane consists of two boron atoms and six hydrogen atoms.
- The hydrogen atoms are categorized into two types: terminal hydrogens and bridging hydrogens.

2. **Identifying Terminal and Bridging Hydrogens**:
- There are four terminal hydrogen atoms, which are directly bonded to the boron atoms.
- There are two bridging hydrogen atoms, which are shared between the two boron atoms.

3. **Visualizing the Structure**:
- In the structure of diborane, the four terminal hydrogen atoms are positioned in one plane.
- The two boron atoms are positioned in a plane that is perpendicular to the plane of the terminal hydrogens.

4. **Final Arrangement of Atoms**:
- The correct arrangement can be summarized as follows:
- The four terminal hydrogen atoms and the two boron atoms lie in one plane.
- The two bridging hydrogen atoms lie in a plane that is perpendicular to the plane of the boron and terminal hydrogen atoms.

5. **Conclusion**:
- Based on the analysis, the correct option is that the four bridging hydrogen atoms and boron atoms lie in one plane, while the two terminal hydrogen atoms lie in a plane perpendicular to this plane.

### Answer:
The correct option is: **4 bridging hydrogen atoms and boron atoms lie in one plane and 2 terminal hydrogen atoms lie in a plane perpendicular to this plane.**

---