d and f Block Elements Part 1

A. Chlorophyll is coordination complex of Mg.
B. Vitamin B12, cyanocobalamine is a coordination compound of cobalt.
C. cis-platin [Pt(NH3)2Cl2] used in the treatment of cancer and is a coordination compound of platinum.
D. Grubbs catalyst is a series of catalysts containing ruthenium.
∴ Correct match is (A-iv), (B-iii), (C-ii), (D-i)