Which form of iron is found in haemoglobin ?

Options

A. `fe^(2+)`
B. `fe^(3+)`
C. in the form of molecule
D. in the form of feO

Answer

**Step-by-Step Solution:**

1. **Understanding Hemoglobin**: Hemoglobin is a respiratory pigment found in red blood cells (RBCs) that plays a crucial role in transporting oxygen throughout the body.

2. **Structure of Hemoglobin**: Hemoglobin is a globular protein made up of multiple polypeptide chains. It contains a heme group, which is essential for its function.

3. **Role of Iron in Hemoglobin**: The heme group contains iron, which is critical for binding oxygen.

4. **Identifying the Form of Iron**: The iron in the heme group exists in a specific oxidation state. There are two common oxidation states of iron: Fe2+ (ferrous) and Fe3+ (ferric).

5. **Functionality of Iron in Hemoglobin**: The Fe2+ form of iron can reversibly bind to oxygen, allowing hemoglobin to pick up oxygen in the lungs and release it in the tissues. In contrast, Fe3+ cannot bind oxygen effectively.

6. **Conclusion**: Therefore, the form of iron found in hemoglobin is Fe2+.

**Final Answer**: The form of iron found in hemoglobin is Fe2+.

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