Which of the following statements is correct for diborane?

Options

A. Small amines like `NH_(3), CH_(3)NH_(2)` give unsymmetrical cleavage of diborane.
B. Large amines such as `(CH_(3))_(3)N` and pyridine gives symmetrical cleavage of diborane.
C. Small as well as large amines both gives symmetrical cleavage of diborane.
D. (A) and (B) both

Explanation

To determine which statements are correct regarding diborane (B2H6), we will analyze each option step by step.

### Step 1: Understand the structure of diborane
Diborane consists of two boron atoms and six hydrogen atoms. It can be represented as B2H6. The boron atoms in diborane can form bonds with other molecules, particularly with amines.

**Hint:** Remember that diborane has a unique structure that allows it to interact with Lewis bases.

### Step 2: Analyze the interaction with small amines
Small amines, such as ammonia (NH3), interact with diborane to form a complex. When diborane reacts with small amines, it leads to an unsymmetrical cleavage. This means that the boron-hydrogen bonds break in a way that does not distribute equally between the two boron atoms.

**Hint:** Focus on how the size of the amine affects the cleavage of diborane.

### Step 3: Analyze the interaction with large amines
In contrast, large amines like trimethylamine (CH3)3N and pyridine interact with diborane to produce symmetrical cleavage. This means that the cleavage occurs evenly, resulting in the formation of two units of BH3. The larger size of these amines allows for a more symmetrical distribution of the boron atoms during the reaction.

**Hint:** Consider how the steric hindrance of larger amines influences the cleavage pattern.

### Step 4: Evaluate the options
- **Option 1:** Small amines like ammonia give unsymmetrical cleavage of diborane. **(Correct)**
- **Option 2:** Large amines such as trimethylamine and pyridine give symmetrical cleavage of diborane. **(Correct)**
- **Option 3:** Small as well as large amines give symmetrical cleavage of diborane. **(Incorrect)**
- **Option 4:** A and B both are correct choices. **(Correct)**

### Conclusion
Both statements A and B are correct. Therefore, the correct answer is **Option D: A and B both are correct choices.**