Match the entries of column I with appropriate entries of column II and choose the correct option out of the four options given.
| Column I | Column II |
| (Metal ion configuration in strong ligand field) | (CFSE, Δo value) |
| (A) d4 | (p) -1.6 |
| (B) d5 | (q) -1.8 |
| (C) d6 | (r) -2.0 |
| (D) d7 | (s) -2.4 |
Answer & explanation
Correct answer: option 3
Metal ion configuration in strong ligand field
(A) d4: t2g4 eg0
CFSE = 4(-0.4Δo) = -1.6Δo
(B) d5: t2g5 eg0
CFSE = 5(-0.4Δo) = -2.0Δo
(C) d6: t2g6 eg0
CFSE = 6(-0.4Δo) = -2.4Δo
(D) d7 = t2g6 eg1
CFSE = 6(-0.4Δo) + 1(0.6Δo) = -1.8Δo