For high spin and low spin $d^{6}$ octahedral complexes $\left(\mathrm{ML}_{6}\right)$, the generally observed spin allowed transitions respectively, are
(a)two and one
(b)one and two
(c)zero and one
(d)two and two
Answer
Answer: B ✓ checked by 4AB · confidence high
Explanation
High-spin d⁶ (⁵D ground term): a single spin-allowed band ⁵T₂g → ⁵E_g. Low-spin d⁶ (¹A₁g): two spin-allowed bands ¹A₁g → ¹T₁g and ¹A₁g → ¹T₂g.