Select the correct statements from the following:
(A) EDTA is used in the treatment of lead poisoning
(B) vitamin \( B_{12} \) is a coordination complex of Co
(C) chlorophyll is a coordination complex of Fe
(D) Wilkinson catalyst is a rhodium complex used for hydrogenation of alkenes
Choose the correct answer from the options given below:
Answer & explanation
Correct answer: option 1
The correct answer is Option (1) → (A), (B) and (D) only
Coordination compounds are important in biology, medicine and industry. Many of these uses rest on chelation (a ligand holding a metal ion through several donor atoms) or on the metal ion at the centre of a biological complex.
(A) EDTA is used in the treatment of lead poisoning — Correct. EDTA is a hexadentate ligand; it binds \( \ce{Pb^{2+}} \) as a stable chelate that is removed from the body.
(B) vitamin \(B_{12}\) is a coordination complex of Co — Correct. Vitamin B12, cyanocobalamin, the anti-pernicious anaemia factor, is a coordination compound of cobalt.
(C) chlorophyll is a coordination complex of Fe — Incorrect. Chlorophyll, the pigment of photosynthesis, is a coordination compound of magnesium. The iron complex is haemoglobin, the oxygen carrier of blood.
(D) Wilkinson catalyst is a rhodium complex used for hydrogenation of alkenes — Correct. Wilkinson’s catalyst is \( \ce{[(Ph3P)3RhCl]} \), a rhodium complex used for the hydrogenation of alkenes:
\( \displaystyle \ce{R-CH=CH2 + H2} \xrightarrow{\ce{[(Ph3P)3RhCl]}} \ce{R-CH2-CH3} \)
NCERT (2026-27 edition):
Importance and Applications of Coordination Compounds – “… Coordination compounds are of great importance in biological systems. The pigment responsible for photosynthesis, chlorophyll, is a coordination compound of magnesium. Haemoglobin, the red pigment of blood which acts as oxygen carrier is a coordination compound of iron. Vitamin B12, cyanocobalamine, the anti– pernicious anaemia factor, is a coordination compound of cobalt.”
Importance and Applications of Coordination Compounds – “Coordination compounds are used as catalysts for many industrial processes. Examples include rhodium complex, [(Ph3P)3RhCl], a Wilkinson catalyst, is used for the hydrogenation of alkenes.”
Importance and Applications of Coordination Compounds – “There is growing interest in the use of chelate therapy in medicinal chemistry. … EDTA is used in the treatment of lead poisoning.”