Which among the following is not a borane

Options

A. `B_(2)H_(6)`
B. `B_(3)H_(6)`
C. `B_(4)H_(10)`
D. None of these

Explanation

To determine which of the given compounds is not a borane, we need to understand the classification of boranes and their general formulas.

### Step 1: Understand Boranes
Boranes are compounds of boron and hydrogen. They can be classified into different types based on their structure:
- **Nido boranes**: These have the general formula \( B_nH_{n+4} \).
- **Arachno boranes**: These have the general formula \( B_nH_{n+6} \).
- **Closo boranes**: These have the general formula \( B_nH_n \).

### Step 2: Analyze the Given Options
We will analyze the compounds based on the formulas provided in the question. Let's assume the options are:
1. \( B_2H_6 \)
2. \( B_3H_6 \)
3. \( B_4H_{10} \)

### Step 3: Check Each Compound
1. **For \( B_2H_6 \)**:
- This fits the Nido borane formula: \( B_nH_{n+4} \) where \( n = 2 \) gives \( H = 2 + 4 = 6 \).
- Thus, \( B_2H_6 \) is a borane.

2. **For \( B_3H_6 \)**:
- If we apply the Nido formula: \( n = 3 \) gives \( H = 3 + 4 = 7 \) (not 6).
- If we apply the Arachno formula: \( n = 3 \) gives \( H = 3 + 6 = 9 \) (not 6).
- Therefore, \( B_3H_6 \) does not fit either classification of boranes.

3. **For \( B_4H_{10} \)**:
- This fits the Nido borane formula: \( n = 4 \) gives \( H = 4 + 4 = 8 \) (not 10).
- However, it fits the Arachno formula: \( n = 4 \) gives \( H = 4 + 6 = 10 \).
- Thus, \( B_4H_{10} \) is a borane.

### Conclusion
From the analysis, the compound that is not a borane is:
- **\( B_3H_6 \)**