Based on Valence Bond Theory, match the complexes listed in Column I with the number of unpaired electrons on the central metal ion, given in Column II
| Complex ions | Number of unpaired electrons |
| (A) \(\left[\mathrm{FeF}_{6}\right]^{3-}\) | (P) 0 |
| (B) \(\left[\mathrm{Fe}(\mathrm{CN})_{6}\right]^{4-}\) | (Q) 1 |
| (C) \(\left[\mathrm{Fe}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{2+}\) | (R) 5 |
| (D) \(\left[\mathrm{Fe}(\mathrm{CN})_{6}\right]^{3-}\) | (S) 4 |
1
A = S, B = Q, C = R, D = P
2
A = S, B = Q, C = P, D = R
3
A = R, B = P, C = S, D = Q
4
A = R, B = S, C = Q, D = P