A covalent bond will be formed by the overlapping of atomic orbitals having single electron of opposite spin, according to the overlapping of atomic orbitals the covalent bond may be of two types :
(i) Sigma bond `(sigma) " " (ii) ` Pi bond `(pi)`
Sigma bond is stronger bond than the Pi-bond. If atomic orbitals overlap about the nuclear axis then sigma bond is formed but when atomic orbitals overlap sideway then Pi-bond is formed.
Compound having maximum bond angle is :

Options

A. `BBr_(3)`
B. `BCl_(3)`
C. `BF_(3)`
D. none of these

Answer

To determine which compound has the maximum bond angle, we will analyze the boron compounds mentioned in the question: BBr3, BCl3, and BF3. We will consider their hybridization, bond angles, and the effect of electronegativity on these angles.

### Step-by-Step Solution:

1. **Identify the Hybridization of Boron Compounds**:
- All three compounds (BBr3, BCl3, BF3) contain boron, which is in group 13 of the periodic table and has three valence electrons.
- Boron undergoes **sp² hybridization** to form three equivalent bonds with the halogen atoms.

2. **Determine the Bond Angles**:
- In sp² hybridization, the ideal bond angle is **120 degrees**. However, the actual bond angles can vary based on the electronegativity of the surrounding atoms.

3. **Analyze Electronegativity**:
- The electronegativity values of the halogens are as follows:
- Fluorine (F): Highest electronegativity
- Chlorine (Cl): Moderate electronegativity
- Bromine (Br): Lowest electronegativity
- The bond angle is inversely proportional to the electronegativity of the surrounding atom. This means that as the electronegativity of the surrounding atom increases, the bond angle decreases.

4. **Compare the Compounds**:
- **BF3**: Fluorine has the highest electronegativity, leading to the smallest bond angle.
- **BCl3**: Chlorine has moderate electronegativity, resulting in a larger bond angle than BF3 but smaller than BBr3.
- **BBr3**: Bromine has the lowest electronegativity, which means it will have the largest bond angle among the three compounds.

5. **Conclusion**:
- Therefore, the compound with the maximum bond angle is **BBr3**.

### Final Answer:
The compound having the maximum bond angle is **BBr3**.