According to MOT, two atomic orbitals overlap resulting in the formation of molecular orbital formed. Number of atomic orbitals overlapping together is equal to the molecule orbital formed. The two atomic orbital thus formed by LCAO (linear combination of atomic orbital) in the phase or in the different phase are known as bonding and antibonding molecular orbitals respectively. The energy of bonding molecular orbital is lower than that of the pure atomic orbitals by an amount `Delta`. This known as the stabilization energy. The enerby of antibonding molecular orbital in increased by `Delta'` (destabilisation energy).
Q. Which of the following statements is not correct regarding bonding molecular orbitals?

Options

A. Bonding molecular orbitals possess low energy than the atomic orbitals from which they are formed
B. Bonding molecular orbitals have low electron density the two nuclei
C. Electron in bonding molecular contributes to the attraction between atoms.
D. They are formed when the lobes of the combining atomic orbitals have the same sign.

Explanation

To determine which statement is not correct regarding bonding molecular orbitals (BMOs), we can analyze the provided statements one by one based on the principles of Molecular Orbital Theory (MOT).

### Step-by-Step Solution:

1. **Understand the Definition of Bonding Molecular Orbitals (BMOs)**:
- Bonding molecular orbitals are formed when two atomic orbitals combine in phase (i.e., with the same sign). This leads to an increase in electron density between the two nuclei, resulting in a stable bond.

2. **Evaluate Statement A**:
- **Statement**: "Bonding molecular orbitals possess low energy than atomic orbitals from which they are formed."
- **Analysis**: This statement is correct. BMOs are lower in energy compared to the atomic orbitals from which they are formed, leading to greater stability.

3. **Evaluate Statement B**:
- **Statement**: "Bonding molecular orbitals have low electron density of the two nuclei."
- **Analysis**: This statement is incorrect. In fact, bonding molecular orbitals have high electron density between the two nuclei, which is what leads to the attraction and stability of the bond. Therefore, this is the statement that is not correct.

4. **Evaluate Statement C**:
- **Statement**: "Electrons in bonding molecular orbitals contribute to the attraction between atoms."
- **Analysis**: This statement is correct. The electrons in BMOs do contribute to the attractive forces between the nuclei of the bonded atoms.

5. **Evaluate Statement D**:
- **Statement**: "They are formed when the lobes of the combining atomic orbitals have the same sign."
- **Analysis**: This statement is also correct. BMOs are indeed formed when the lobes of the combining atomic orbitals have the same sign, which allows for constructive interference and increased electron density between the nuclei.

6. **Conclusion**:
- The only statement that is not correct regarding bonding molecular orbitals is **Statement B**.

### Final Answer:
**Statement B is not correct regarding bonding molecular orbitals.**