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Coordination compounds play a vital role in living systems. With this in mind, which one of the following statements is not correct?

1. Cyanocobalamin corresponds to vitamin B12 and has cobalt in it
2. Haemoglobin is the red colouring matter of blood and contains iron
3. Chlorophyll is the green pigment found in plants and contains calcium
4. Carboxypeptidase A is an enzyme that contains zinc

Correct answer: Chlorophyll is the green pigment found in plants and contains calcium

Solution

Chlorophyll is actually a complex molecule that contains magnesium, not calcium, which is essential for its role in photosynthesis. This makes the statement incorrect.

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