Match the coordination compounds given in List-I with the central metal atoms given in List-II
|
List-I Coordination compound |
List-II Central metal atom |
|
(A) blood pigment |
(I) iron |
|
(B) chlorophyll |
(II) magnesium |
|
(C) vitamin \( B_{12} \) |
(III) rhodium |
|
(D) wilkinson catalyst |
(IV) cobalt |
Choose the correct answer from the options given below:
Answer & explanation
Correct answer: option 3
The correct answer is Option (3) → (A)-(I), (B)-(II), (C)-(IV), (D)-(III)
Several substances of biological and industrial importance are coordination compounds: a central metal ion surrounded by ligands, often a large ring (porphyrin or corrin) that binds the metal through four nitrogen atoms.
(A) blood pigment — This matches (I) iron. Haemoglobin, the red pigment of blood, has an iron(II) ion in a porphyrin ring (haem); the iron binds the oxygen carried by the blood.
(B) chlorophyll — This matches (II) magnesium. Chlorophyll, the green pigment that absorbs light for photosynthesis, has a \( \ce{Mg^2+} \) ion in a porphyrin-type ring.
(C) vitamin \(B_{12}\) — This matches (IV) cobalt. Vitamin B12 (cyanocobalamin), the anti-pernicious anaemia factor, has a cobalt ion in a corrin ring.
(D) wilkinson catalyst — This matches (III) rhodium. Wilkinson’s catalyst, \( \ce{[RhCl(PPh3)3]} \), is a rhodium complex used for the hydrogenation of alkenes:
\( \displaystyle \ce{RCH=CH2 + H2} \xrightarrow{\ce{[RhCl(PPh3)3]}} \ce{RCH2-CH3} \)
Shortcut: Vitamin B12 is the cobalt compound; (C)-(IV) appears only in Option (3).
NCERT (2026-27 edition):
Importance and Applications of Coordination Compounds – …
