Central atom utilising \( sp^2 \) hybrid orbitals:
\[ \text{SO}_2, \, \text{C}_2\text{H}_4, \, \text{BCl}_3, \, \text{HCHO}, \, \text{C}_6\text{H}_6, \, \text{BF}_3 \]
List-I ( Ions ) | List-II ( No. of unpaired electrons ) | ||
A | Zn$^{2+}$ | (I) | 0 |
B | Cu$^{2+}$ | (II) | 4 |
C | Ni$^{2+}$ | (III) | 1 |
D | Fe$^{2+}$ | (IV) | 2 |