For an electronic configuration of two non-equivalent π electronics [π¹, π¹] which of the Following terms is not possible?

Q50 · CSIR-NET Chemistry, December 2013

Paper: CSIR-NET December 2013 · Subject: Inorganic Chemistry · Chapter: Coordination Chemistry · Topic: Electron Transfer Redox · Marks: 2 · Difficulty: Medium

For an electronic configuration of two non-equivalent $\pi$ electronics $\left[\pi^{1}, \pi^{1}\right]$ which of the Following terms is not possible?

(a)${ }^{1} \Sigma$

(b)${ }^{3} \Sigma$

(c)${ }^{3} \Delta$

(d)${ }^{3} \phi$

Answer

Answer: D ✓ checked by 4AB · confidence high

Explanation

Two non-equivalent π electrons give Λ = 0 (Σ⁺, Σ⁻) and Λ = 2 (Δ), each as singlet and triplet: ¹Σ, ³Σ, ¹Δ, ³Δ. A Π term (Λ = 1) cannot arise.

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