In Alcoholic fermentation of Glucose, the net gain of `NADH_(2)` is

Options

A. One
B. zero
C. three
D. Four

Answer

To solve the question regarding the net gain of NADH in alcoholic fermentation of glucose, we can break it down into the following steps:

### Step-by-Step Solution:

1. **Understanding Alcoholic Fermentation**:
- Alcoholic fermentation is a type of anaerobic respiration that occurs in the absence of oxygen. It primarily involves the conversion of glucose into ethanol and carbon dioxide.

2. **Glycolysis Process**:
- The first step in alcoholic fermentation is glycolysis. During glycolysis, one molecule of glucose (6 carbons) is broken down into two molecules of pyruvate (3 carbons each).
- This process generates a net gain of 2 NADH and 2 ATP molecules.

3. **Conversion of Pyruvate**:
- After glycolysis, the pyruvate molecules undergo fermentation. In alcoholic fermentation, pyruvate is converted into ethanol and carbon dioxide.
- During this conversion, NADH is oxidized back to NAD⁺. This step is crucial because it regenerates NAD⁺, which is necessary for glycolysis to continue.

4. **Net Gain of NADH**:
- In the entire process of alcoholic fermentation, although 2 NADH are produced during glycolysis, they are subsequently converted back to NAD⁺ during the fermentation step.
- Therefore, the net gain of NADH in alcoholic fermentation is zero, as all produced NADH is used up in the process.

5. **Conclusion**:
- The net gain of NADH in alcoholic fermentation of glucose is 0.

### Final Answer:
The net gain of NADH in alcoholic fermentation of glucose is **0**.

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