Boron with hydrogen forms a number of hydrides which are known are boranes. These hydrides are classified into closoboranes and nidobarances. The simplest hydride of boron is diborane. Boron apart from having `(2c, 2e)` bonds also contain `(3c, 2e)` bonds.
In `B_(2)H_(6)`,

Options

A. There is `B-B` bond
B. All the atoms are in one plane
C. The boron atoms are linked through hydrogen bridges
D. All the `B-H` bond distances are equal

Answer

To solve the question regarding diborane (B₂H₆) and its bonding characteristics, we will go through the following steps:

### Step 1: Understand the Structure of Diborane (B₂H₆)
Diborane consists of two boron atoms and six hydrogen atoms. The structure can be visualized as follows:
- There are two boron atoms in the center.
- Four hydrogen atoms are terminal, each bonded to a boron atom.
- Two hydrogen atoms act as bridging hydrogen atoms, connecting the two boron atoms.

### Step 2: Identify the Types of Bonds
In diborane, there are two types of bonds:
- **Two-centered, two-electron (2c, 2e) bonds**: These are the bonds between the boron atoms and the terminal hydrogen atoms.
- **Three-centered, two-electron (3c, 2e) bonds**: These are the bonds formed by the two bridging hydrogen atoms, which share their electrons with both boron atoms.

### Step 3: Analyze the Statements
Now, we will evaluate the provided statements based on the structure of diborane:

1. **There is a B-B bond**:
- In diborane, there is no direct B-B bond; the boron atoms are connected through the bridging hydrogen atoms.
- **Conclusion**: This statement is incorrect.

2. **All the atoms are in one plane**:
- The four terminal hydrogen atoms and the two boron atoms are in one plane, but the two bridging hydrogen atoms are above and below this plane.
- **Conclusion**: This statement is incorrect.

3. **The boron atoms are linked together through hydrogen bridges**:
- The two boron atoms are indeed connected through the two bridging hydrogen atoms.
- **Conclusion**: This statement is correct.

4. **All the boron-hydrogen bond distances are equal**:
- The bond distances for the terminal hydrogen atoms (1.19 Å) are different from those of the bridging hydrogen atoms (1.33 Å).
- **Conclusion**: This statement is incorrect.

### Step 4: Final Conclusion
Based on the analysis, the only correct statement is that the boron atoms are linked together through hydrogen bridges. Therefore, the correct answer is option C.

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