Question

Co-ordination compounds have great importance in biological systems. In this context which of the
following statements is incorrect?

• A. Chlorophylls are green pigments in plants and contain calcium
• B. Haemoglobin is the red pigments of blood and contains iron
• C. Cyanocobalamin is vitamin B12 and contains cobalt
• D. Carboxypeptidase-A is an enzyme and contains zinc

Answer 1

Answer: (A)

Chlorophylls are green pigments in plants and contain calcium

Chlorophyll is the green pigment in plants that helps in photosynthesis. The metal inside the ring structure of chlorophyll is magnesium $\left(M{g}^{2+}\right)$. The four nitrogen atoms in the ring structure of chlorophyll are bonded to the magnesium ion.