The reactants in the industrial method of preparation of diborane are

Options

A. `BCl_3 + Li AlH_4`
B. `BF_3 + LiAlH_4`
C. `BF_3 + LiH`
D. `BF_3 + H_2`

Answer

To answer the question regarding the reactants in the industrial method of preparation of diborane (B2H6), we can break down the solution into clear steps:

### Step-by-Step Solution:

1. **Identify the Industrial Method**: The industrial method for the preparation of diborane involves specific chemical reactants.

2. **Determine the Reactants**: The primary reactants used in this method are:
- Boron trifluoride (BF3)
- Lithium hydride (LiH)

3. **Write the Reaction**: The reaction between these two reactants can be represented as follows:
\[ 2 \text{BF}_3 + 6 \text{LiH} \rightarrow \text{B}_2\text{H}_6 + 6 \text{LiF} \]
Here, diborane (B2H6) and lithium fluoride (LiF) are produced.

4. **Balance the Equation**: To ensure that the reaction is balanced, we can check the number of atoms of each element on both sides:
- Left side: 2 Boron (from 2 BF3), 6 Fluorine (from 2 BF3), 6 Lithium (from 6 LiH), and 6 Hydrogen (from 6 LiH).
- Right side: 2 Boron (from B2H6), 6 Lithium (from 6 LiF), and 6 Fluorine (from 6 LiF), and 6 Hydrogen (from B2H6).
The equation is balanced.

5. **Conclusion**: Therefore, the reactants in the industrial method of preparation of diborane are:
- Boron trifluoride (BF3)
- Lithium hydride (LiH)

### Final Answer:
The reactants in the industrial method of preparation of diborane are BF3 and LiH.

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