Match the columns.
| Transitions | Examples |
| 1. d-d transition | a. KMnO4 |
| 2. Ligand to metal charge transfer | b. [Ti(H2O)6]+3 |
| 3. Metal to ligand charge transfer | c. Ni(CO)4 |
| 4. Interligand charge transfer | d. [Cu(en)2]+ |
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