Q62 · CSIR-NET Chemistry, December 2015

Paper: CSIR-NET December 2015 · Subject: Inorganic Chemistry · Chapter: Coordination Chemistry · Topic: Coordination Chemistry – General · Marks: 2 · Difficulty: Easy

The symmetry-allowed atomic transition among the following is

(a)$^{3}F \rightarrow {}^{1}D$

(b)$^{3}F \rightarrow {}^{3}D$

(c)$^{3}F \rightarrow {}^{1}P$

(d)$^{3}F \rightarrow {}^{3}P$

Answer

Answer: B ✓ checked by 4AB · confidence high

The source book printed no answer; this one was worked out and checked — see the explanation.

Explanation

Allowed: ΔS = 0 and ΔL = 0, ±1 (not 0↔0). ³F → ³D keeps the multiplicity and has ΔL = −1; ³F → ³P has ΔL = −2, and the singlet targets break ΔS = 0.

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