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Which combination will lead to pi-molecu...

Which combination will lead to `pi`-molecular orbitals ?
(i) 2px-2px (ii) 2pz+2pz (iii) 2s+2pz (iv) 2py+2py

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To determine which combinations will lead to the formation of π-molecular orbitals, we need to analyze each of the given combinations based on the principles of molecular orbital theory. ### Step-by-Step Solution: 1. **Understanding Molecular Orbitals**: - Molecular orbitals are formed by the combination of atomic orbitals. There are two types of combinations: - **Sigma (σ) bonds**: Formed by head-on (end-to-end) overlap of orbitals. - **Pi (π) bonds**: Formed by sidewise (lateral) overlap of orbitals. 2. **Analyzing Each Combination**: - **(i) 2px - 2px**: - The 2px orbitals can overlap sidewise, leading to the formation of a π-molecular orbital. The negative sign indicates an antibonding orbital (π*). - **Conclusion**: This combination can lead to π-molecular orbitals. - **(ii) 2pz + 2pz**: - The 2pz orbitals overlap end-to-end, which leads to the formation of a σ-bond, not a π-bond. - **Conclusion**: This combination does not lead to π-molecular orbitals. - **(iii) 2s + 2pz**: - The 2s orbital overlaps with the 2pz orbital in a head-on manner, leading to the formation of a σ-bond. - **Conclusion**: This combination does not lead to π-molecular orbitals. - **(iv) 2py + 2py**: - The 2py orbitals can also overlap sidewise, leading to the formation of a π-molecular orbital. - **Conclusion**: This combination can lead to π-molecular orbitals. 3. **Final Answer**: - The combinations that lead to π-molecular orbitals are **(i) 2px - 2px** and **(iv) 2py + 2py**. ### Summary: - **Combinations leading to π-molecular orbitals**: (i) 2px - 2px and (iv) 2py + 2py. ---
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