Which one of the following will yield more energy :-

Options

A. `C_(6)H_(12)O_(6)rarr2CH_(3)COCOOH`
B. `C_(6)H_(12)O_(6)rarr2C_(2)H_(5)OH+2CO_(2)`
C. `C_(6)H_(12)O_(6)rarr2C_(3)H_(6)O_(3)`
D. `C_(6)H_(12)O_(6)rarr2CO_(2)+6H_(2)O`

Answer

To determine which process yields more energy from glucose, we need to analyze the different pathways of glucose metabolism. Here’s a step-by-step breakdown of the processes involved:

### Step 1: Identify the Processes
We have four processes to consider:
1. Glycolysis (glucose to pyruvic acid)
2. Anaerobic respiration (glucose to ethanol and carbon dioxide)
3. Anaerobic respiration (glucose to lactic acid)
4. Aerobic respiration (glucose to carbon dioxide and water)

### Step 2: Analyze Glycolysis
- Glycolysis is the first step in glucose metabolism where glucose (6 carbons) is converted into pyruvic acid (3 carbons).
- This process yields a net gain of **2 ATP molecules**.

### Step 3: Analyze Anaerobic Respiration to Ethanol
- In anaerobic conditions, glucose is converted into ethanol and carbon dioxide.
- This process also yields **2 ATP molecules**.

### Step 4: Analyze Anaerobic Respiration to Lactic Acid
- Similarly, in anaerobic conditions, glucose can be converted into lactic acid.
- This process also yields **2 ATP molecules**.

### Step 5: Analyze Aerobic Respiration
- In aerobic respiration, glucose is completely oxidized to carbon dioxide and water.
- This complete breakdown yields a significantly higher amount of energy, producing **36 to 38 ATP molecules**.

### Step 6: Conclusion
- Among the processes analyzed, the complete oxidation of glucose in aerobic respiration yields the most energy, providing **36 to 38 ATP**.
- Therefore, the correct answer is the process where glucose is converted into carbon dioxide and water (option 4).

### Final Answer
The process that yields the most energy is the complete oxidation of glucose to carbon dioxide and water.

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