Select the incorrect statement for diborane

Options

A. Boron is approximately `sp^(3)` hybridized.
B. `B-H-B" angle is "180^(@)`
C. There are two terminal B - H bonds for each boron atom.
D. There are only 12 bonding electrons.

Explanation

To solve the question of selecting the incorrect statement for diborane (B2H6), let's analyze each statement step by step.

### Step 1: Understanding the Structure of Diborane
Diborane (B2H6) consists of two boron atoms and six hydrogen atoms. It has a unique structure where there are two types of hydrogen atoms: terminal and bridging.

### Step 2: Analyzing Each Statement
1. **Statement 1: Boron is approximately sp3 hybridized.**
- **Analysis:** In diborane, each boron atom is involved in forming four bonds (three with hydrogen and one bridging bond). This suggests that the boron atoms are indeed sp3 hybridized. This statement is **correct**.

2. **Statement 2: The B-H-B angle is 180 degrees.**
- **Analysis:** The B-H-B angle in diborane is not 180 degrees. The actual angle is approximately 120 degrees due to the trigonal planar arrangement of the terminal hydrogens and the bridging hydrogens. This statement is **incorrect**.

3. **Statement 3: There are two terminal BH bonds for each boron atom.**
- **Analysis:** Each boron atom in diborane forms two terminal bonds with hydrogen atoms. This statement is **correct**.

4. **Statement 4: There are only 12 bonding electrons.**
- **Analysis:** In diborane, there are a total of 12 bonding electrons. Each boron contributes 3 electrons (2 for terminal bonds and 1 for the bridging bond), and each hydrogen contributes 1 electron. Thus, the total is 2 boron atoms × 3 electrons + 6 hydrogen atoms × 1 electron = 12 bonding electrons. This statement is **correct**.

### Conclusion
The incorrect statement regarding diborane is **Statement 2: The B-H-B angle is 180 degrees**. The correct angle is approximately 120 degrees.

### Final Answer
The incorrect statement for diborane is: **The B-H-B angle is 180 degrees.**

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