Select the incorrectly matched pair

Options

A. End products of alcoholic fermentation - Ethanol + `CO_(2)`
B. End products of lactic acid fermentation - Lactic acid + `CO_(2)`
C. Obligate anaerobe - Clostridium tetani
D. RQ of carbohydrates - One

Answer

To solve the question of selecting the incorrectly matched pair, we will analyze each option provided in the question step by step.

### Step-by-Step Solution:

1. **Identify the Options**: We need to look at each option that is presented to us and determine whether the pairs are correctly matched or not.

2. **First Option**:
- **Statement**: End product of alcoholic fermentation is ethanol and carbon dioxide.
- **Analysis**: This statement is correct. During alcoholic fermentation, one mole of glucose is converted into two moles of ethanol and two moles of carbon dioxide.
- **Conclusion**: This is a correctly matched pair.

3. **Second Option**:
- **Statement**: End product of lactic acid fermentation is lactic acid plus carbon dioxide.
- **Analysis**: This statement is incorrect. The end product of lactic acid fermentation is primarily lactic acid, and it does not produce carbon dioxide.
- **Conclusion**: This is an incorrectly matched pair.

4. **Third Option**:
- **Statement**: Obligate anaerobic Clostridium tetani.
- **Analysis**: This statement is correct. Clostridium tetani is indeed an obligate anaerobe and is known to cause tetanus.
- **Conclusion**: This is a correctly matched pair.

5. **Fourth Option**:
- **Statement**: RQ of carbohydrate is 1.
- **Analysis**: This statement is correct. The respiratory quotient (RQ) for carbohydrates is indeed 1, as the amount of carbon dioxide produced is equal to the amount of oxygen consumed.
- **Conclusion**: This is a correctly matched pair.

### Final Conclusion:
After analyzing all the options, the incorrectly matched pair is the **second option**, which states that the end product of lactic acid fermentation is lactic acid plus carbon dioxide.