| $LIST-I$ (Substances) | $LIST-II$ (Element Present) |
| $A$. Ziegler catalyst | $I$. Rhodium |
| $B$. Blood pigment | $II$. Cobalt |
| $C$. Wilkinson catalyst | $III$. Iron |
| $D$. Vitamin $B_{12}$ | $IV$. Titanium |
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