Which is a correct statement about diborane structure ? .

Options

A. All `HBH` bond angles are equal
B. `All -H -B` bond lenghts are equal
C. it has two three-center-2 electron bonds
D. All hydrogen and boron atoms are in one plane

Explanation

To solve the question regarding the correct statement about the structure of diborane (B2H6), we will analyze the structure and properties of diborane step by step.

### Step-by-Step Solution:

1. **Understanding Diborane**:
- Diborane is a chemical compound with the formula B2H6. It consists of two boron (B) atoms and six hydrogen (H) atoms.

2. **Hybridization of Boron**:
- In diborane, boron atoms undergo sp3 hybridization. Each boron atom forms three bonds with hydrogen atoms, leading to a unique bonding situation.

3. **Formation of the Structure**:
- Each boron atom in diborane forms three B-H bonds. However, two of these bonds are not typical covalent bonds; they are referred to as "banana bonds" or three-center two-electron bonds. This occurs due to the presence of an empty p-orbital on each boron atom that overlaps with the hydrogen atoms.

4. **Geometric Arrangement**:
- The structure of diborane is not planar. The two boron atoms are connected by two hydrogen atoms that lie in a plane, while the remaining four hydrogen atoms are arranged such that two are in the same plane as the boron atoms and two are above and below this plane, creating a three-dimensional shape.

5. **Bond Angles and Lengths**:
- The bond angles in diborane are not all equal. The H-B-H bond angles for the hydrogen atoms in the plane are approximately 120 degrees, while the bond angles involving the hydrogen atoms above and below the plane differ.

6. **Conclusion**:
- Based on the analysis, the correct statement about diborane structure is that not all H-B-H bond angles are equal, and the bond lengths of B-H bonds are also not equal due to the varying nature of the bonding.

### Final Answer:
The correct statement about diborane structure is that **the bond angles are not equal and the bond lengths are not equal**.