Tricarboxylic acids of Kerbs cycle are

Options

A. Succinic acid, Fumaric acid and Citric acid
B. Oxalosuccinic acid, Citric acid and `alpha`-ketoglutaric acid
C. Citric acid, Isocitric acid and Malic acid
D. Citric acid, Isocitric acid and Oxalosuccinic acid.

Answer

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks for the tricarboxylic acids involved in the Krebs cycle, also known as the TCA (Tricarboxylic Acid) cycle.

2. **Identifying the Key Components**: The Krebs cycle starts with acetyl coenzyme A (acetyl CoA), which is a 2-carbon compound. This combines with oxaloacetic acid (a 4-carbon compound) to form citric acid.

3. **Formation of Citric Acid**: The first product of the Krebs cycle is citric acid, which is a 6-carbon compound. Citric acid has three carboxylic acid groups, thus it is classified as a tricarboxylic acid.

4. **Subsequent Reactions**: Citric acid is then converted into isocitric acid (also a 6-carbon compound with three carboxylic groups). This conversion involves the rearrangement of the citric acid molecule.

5. **Further Conversion**: Isocitric acid is then transformed into oxalosuccinic acid, which is again a 6-carbon compound with three carboxylic groups.

6. **Conclusion**: The tricarboxylic acids in the Krebs cycle are:
- Citric acid
- Isocitric acid
- Oxalosuccinic acid

7. **Final Answer**: Therefore, the correct answer is that the tricarboxylic acids of the Krebs cycle are citric acid, isocitric acid, and oxalosuccinic acid.

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