Identify the correct statements regarding the structure of `Al(BH_4)_(3)`.
1. Al is `sp^3d^2 and B` is `sp^3` hybridized
2. It has 6 `3c - 2e^-` bonds
3. It has 6 Al - H - B bonds
4. It has 6 `2c - 2e^-` bonds.

Options

A. only 1,3,4
B. only 1,2,3
C. only 1.24
D. all of 1, 2, 3 and 4

Answer

To solve the question regarding the structure of `Al(BH_4)_(3)`, we will analyze each statement one by one.

### Step 1: Understand the structure of `Al(BH_4)_(3)`
`Al(BH_4)_(3)` consists of one aluminum atom and three boron hydride (BH4) groups. Each BH4 group contains one boron atom and four hydrogen atoms. The aluminum atom is at the center, surrounded by the three BH4 groups.

### Step 2: Analyze the hybridization of Aluminum and Boron
1. **Aluminum Hybridization**: The aluminum atom in `Al(BH_4)_(3)` is surrounded by four groups (the four hydrogen atoms from the three BH4 groups). Therefore, it undergoes `sp^3` hybridization.
2. **Boron Hybridization**: Each boron atom in the BH4 groups is bonded to four hydrogen atoms, which means it also undergoes `sp^3` hybridization.

**Conclusion for Statement 1**: The statement "Al is `sp^3d^2` and B is `sp^3` hybridized" is incorrect because aluminum is `sp^3` hybridized, not `sp^3d^2`.

### Step 3: Count the types of bonds
1. **3c - 2e^- Bonds**: In `Al(BH_4)_(3)`, the bonding between aluminum, boron, and hydrogen can be described as three-centered two-electron (3c-2e) bonds. Each aluminum-hydrogen-boron bond can be considered a 3c-2e bond.
2. **2c - 2e^- Bonds**: The bonds between boron and hydrogen within each BH4 group are two-centered two-electron (2c-2e) bonds.

**Conclusion for Statement 2**: There are indeed 6 3c-2e bonds in the structure. This statement is correct.

**Conclusion for Statement 3**: There are 6 Al-H-B bonds in total, as each BH4 group contributes to the bonding with aluminum. This statement is also correct.

**Conclusion for Statement 4**: The structure contains 6 2c-2e bonds, which are the bonds between boron and hydrogen in each BH4 group. This statement is also correct.

### Final Conclusion
- Statement 1: Incorrect
- Statement 2: Correct
- Statement 3: Correct
- Statement 4: Correct

Thus, the correct statements regarding the structure of `Al(BH_4)_(3)` are statements 2, 3, and 4.