Q38 · CSIR NET Chemistry, June 2018
Paper: CSIR NET June 2018 · Subject: Inorganic Chemistry · Chapter: Coordination Chemistry · Topic: Electron Transfer Redox · Marks: 2 · Difficulty: Medium
The allowed electronic transition in fluorine molecule is
(a)$\Sigma_{g}^{+} \rightarrow \Sigma_{g}^{+}$
(b)$\Sigma_{g}^{+} \rightarrow \Sigma_{g}^{+}$
(c)$\Sigma_{g}^{+} \rightarrow \pi_{u}$
(d)$\Sigma_{g}^{+} \rightarrow \Delta_{u}$
Answer
Answer: C ✓ checked by 4AB · confidence high
Explanation
From the ¹Σg⁺ ground state of F₂, only ¹Σg⁺ → ¹Πu satisfies g↔u and ΔΛ = ±1 (c).
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