| List-$I$ | List-$II$ |
|---|---|
| $(a)$ Chlorophyll | $(i)$ Ruthenium |
| $(b)$ Vitamin-$B_{12}$ | $(ii)$ Platinum |
| $(c)$ Anticancer drug | $(iii)$ Cobalt |
| $(d)$ Grubbs catalyst | $(iv)$ Magnesium |
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