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(C) $1$. $Vitamin \ B_{12}$ (Cyanocobalamin) is a coordination compound of cobalt. $2$. Hemoglobin is a coordination compound of iron $(Fe^{2+})$ and

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Chlorophyll is the green pigment in plants and contains calcium.

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(C) $1$. $Vitamin \ B_{12}$ (Cyanocobalamin) is a coordination compound of cobalt. $2$. Hemoglobin is a coordination compound of iron $(Fe^{2+})$ and acts as an oxygen carrier in blood. $3$. Chlorophyll is a coordination compound of magnesium $(Mg^{2+})$,not calcium. $4$. Carboxypeptidase-$A$ is a zinc-containing enzyme. Therefore,the statement regarding chlorophyll is incorrect.

Coordination compounds have significant importance in biological systems. In this context,which of the following statements is incorrect?

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