Which of the following substrate have maximum RQ value

Options

A. Fat
B. Carbohydrate
C. Prptein
D. oxalic acid

Answer

To determine which substrate has the maximum respiratory quotient (RQ) value, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Concept of RQ**:
- The respiratory quotient (RQ) is defined as the ratio of carbon dioxide (CO2) produced to oxygen (O2) consumed during respiration.
- RQ = CO2 eliminated / O2 taken.

2. **Identify the RQ Values for Different Substrates**:
- Different substrates have different RQ values based on their chemical composition and the amount of oxygen required for their oxidation.
- Common RQ values:
- **Fats**: RQ ≈ 0.7
- **Proteins**: RQ ≈ 0.8 to 0.9
- **Carbohydrates**: RQ = 1 (or unity)
- **Organic Acids (e.g., oxalic acid)**: RQ can be as high as 4.

3. **Compare the RQ Values**:
- From the values identified:
- Fats have the lowest RQ (0.7).
- Proteins have a moderate RQ (0.8 to 0.9).
- Carbohydrates have a higher RQ (1).
- Organic acids, specifically oxalic acid, have the highest RQ (4).

4. **Conclusion**:
- Among the given options (fat, carbohydrate, protein, and oxalic acid), oxalic acid has the maximum RQ value of 4.

### Final Answer:
- The substrate with the maximum RQ value is **oxalic acid**.