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Which of the follwing combinations are n...

Which of the follwing combinations are not permisible ?
(i) 2pz and 2pz (ii) 2s and 2py (iii) 1s and 2s (iv) 2px and 2px

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To determine which combinations of atomic orbitals are not permissible for bonding, we need to analyze the types of overlaps that can occur between the given orbitals. ### Step-by-Step Solution: 1. **Understanding Orbital Types**: - The orbitals mentioned are: 2pz, 2s, 2py, 1s, and 2px. - The 2s orbital is spherical, while the p orbitals (2px, 2py, 2pz) are dumbbell-shaped and oriented along different axes. 2. **Analyzing Each Combination**: - **(i) 2pz and 2pz**: - Both are p orbitals oriented along the z-axis. They can overlap, but since they are identical, they cannot form a stable bond. This combination is not permissible. - **(ii) 2s and 2py**: - The 2s orbital is spherical, while the 2py is oriented along the y-axis. These orbitals do not have the correct orientation to overlap effectively. This combination is also not permissible. - **(iii) 1s and 2s**: - The 1s orbital is spherical and can overlap with the 2s orbital, which is also spherical. This combination is permissible as they can form a bond. - **(iv) 2px and 2px**: - Similar to the first case, both are p orbitals oriented along the x-axis. They can overlap, but since they are identical, they cannot form a stable bond. This combination is not permissible. 3. **Conclusion**: - The combinations that are not permissible are (i) 2pz and 2pz, (ii) 2s and 2py, and (iv) 2px and 2px. ### Final Answer: The combinations that are not permissible are: - (i) 2pz and 2pz - (ii) 2s and 2py - (iv) 2px and 2px
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