Mg is present in

Options

A. Chlorophyll
B. Haemoglobin
C. Vitamin-D
D. Vitamin-B

Answer

**Step-by-Step Solution:**

1. **Identify the Compounds**: The question asks where magnesium (Mg) is present. We need to identify the compounds mentioned in the context.

2. **Analyze Chlorophyll**:
- Chlorophyll is a green pigment found in plants.
- It plays a crucial role in photosynthesis, converting sunlight into chemical energy by synthesizing carbohydrates from carbon dioxide (CO2) and water (H2O).
- The chemical formula for chlorophyll is C55H72O5N4Mg, indicating that magnesium is indeed a part of its structure.

3. **Examine Hemoglobin**:
- Hemoglobin is a protein found in red blood cells responsible for transporting oxygen.
- It consists of four protein chains but does not contain magnesium. Instead, it contains iron (Fe) as a key component.

4. **Look at Vitamin D**:
- Vitamin D is essential for bone health and is involved in calcium metabolism.
- There are several forms of vitamin D (D1, D2, D3, D4, D5), but none of them contain magnesium.

5. **Consider Vitamin B**:
- Vitamin B complex includes several vitamins (B1, B2, B3, B5, B6, B7, B9, B12).
- While these vitamins are crucial for various bodily functions, none of them contain magnesium. For instance, vitamin B12 contains cobalt instead.

6. **Conclusion**:
- After analyzing all the compounds, we conclude that magnesium is present only in chlorophyll and is absent in hemoglobin, vitamin D, and vitamin B.

**Final Answer**: Magnesium is present in chlorophyll.

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