JEE Main · 2004 · 24 Apr 2004 · Offline · Coordination Compounds

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Coordination compound have great importance in biological systems. In this context which of the following statements is incorrect?

(A)Chlorophylls are green pigments in plants and contains calcium✓ Correct
(B)Carboxypeptidase - A is an enzyme and contains zinc
(C)Cyanocobalamin is $B_{12}$ and contains cobalt
(D)Haemoglobin is the red pigment of blood and contains iron

Answer: (A)

Solution

Go through the biological metals. Carboxypeptidase-A holds zinc, vitamin

B X_{12}

(cyanocobalamin) holds cobalt, and haemoglobin holds iron, all correct. The slip is in the chlorophyll statement: the green plant pigment is built around magnesium at the heart of its porphyrin ring, not calcium. That makes the chlorophyll claim the incorrect one.

JEE Main · 2004 · 24 Apr 2004 · Offline · Single correct option

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