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Question:

Match the metals (Column I) with the coordination compound(s) / enzyme(s) (Column II):
Column-I Column-II
(A) Co (i) Wilkinson catalyst
(B) Zn (ii) Chlorophyll
(C) Rh (iii) Vitamin B12
(D) Mg (iv) Carbonic anhydrase

A-ii; B-i; C-iv; D-iii

A-iii; B-iv; C-i; D-ii

A-iv; B-iii; C-i; D-ii

A-i; B-ii; C-iii; D-iv

Solution:

(i) Wilkinson catalyst : RhCl(PPh3)3
(ii) Chlorophyll : C55H72O5N4Mg
(iii) Vitamin B12 (also known as cyanocobalamin) contains cobalt
(iv) Carbonic anhydrase contains a zinc ion.