Question

The following is a coordination compound of iron

• A. chlorophyll
• B. Mohrs salt
• C. haemoglobin
• D. vitamin $B_{12}$

Answer 1

Answer: (C)

Haemoglobin, contains two part $viz$, haem and globular protein. Haem part of haemoglobin contains one $F{e}^{2+}$ ion (iron) coordinated in a square planar array with the four N-atoms of a porphyrin molecule.
Chlorophyll is a coordination compound of $Mg$, vitamin $B_{12}$ is a coordination compound of Co while Mohr's salt is a double salt, not a coordination compound.