Which of the following substances can undergo oxidation and release energy ?

Options

A. Inorganic acids
B. Organic food
C. Organic acid
D. Both (2) & (3)

Answer

To determine which substances can undergo oxidation and release energy, we need to analyze the options provided and understand the concept of cellular respiration and respiratory substrates.

### Step-by-Step Solution:

1. **Understanding Cellular Respiration**:
- Cellular respiration is the process by which cells convert organic compounds into energy. This process involves the oxidation of these compounds, which releases energy that the cell can use for various functions.

2. **Identifying Respiratory Substrates**:
- The substances that can be oxidized during cellular respiration are known as respiratory substrates. Common respiratory substrates include carbohydrates, proteins, and lipids.

3. **Evaluating the Options**:
- **Option 1: Inorganic Acids** - Inorganic acids do not serve as respiratory substrates and therefore cannot undergo oxidation to release energy. This option is incorrect.
- **Option 2: Organic Food** - Organic foods, which primarily consist of carbohydrates, proteins, and lipids, can be oxidized during cellular respiration to release energy. This option is correct.
- **Option 3: Organic Acids** - Organic acids such as oxaloacetic acid, malic acid, and succinic acid can also enter the Krebs cycle and be oxidized to release energy. This option is also correct.
- **Option 4: Both 2 and 3** - Since both organic food and organic acids can serve as respiratory substrates, this option is correct as well.

4. **Conclusion**:
- The correct answer is **Option 4: Both 2 and 3**. This means that both organic food and organic acids can undergo oxidation and release energy.

### Final Answer:
**Option 4: Both 2 and 3 (Organic Food and Organic Acids)**