Molecular Orbital Theory
According to molecular orbital theory, which of the following species is paramagnetic?
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About This Question
- Subject
- chemistry
- Chapter
- chemical bonding and molecular structure
- Topic
- molecular orbital theory
- Difficulty
- Medium
- Year
- 2025
Solution
Correct Answer:
O₂
A species is paramagnetic if it contains one or more unpaired electrons. According to MOT, the configuration of O2 (16 electrons) is: σ1s2σ∗1s2σ2s2σ∗2s2σ2pz2(π2px2=π2py2)(π∗2px1=π∗2py1)
- There are two unpaired electrons in the subshell π∗2p.
- In contrast, N2,F2, and C2 (at least in their ground state configurations) have all electrons paired, making them diamagnetic.
This medium difficulty chemistry question is from the chapter chemical bonding and molecular structure, covering the topic of molecular orbital theory. It appeared in the 2025 exam.
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