Reaction with sodium hydrogen carbonate can be used to distinguish between : \

Options

A. Ethanoic acid and Methanoic acid
B. Ethanol and Methanol
C. Ethanol and Ethanoic acid
D. Ethylacetate and Ethanol

Explanation

To solve the question about how sodium hydrogen carbonate (NaHCO3) can be used to distinguish between two substances, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Substances**: The substances we want to distinguish are ethanol (an alcohol) and ethanoic acid (a carboxylic acid).

2. **Write the Chemical Formulas**:
- Ethanol: C2H5OH
- Ethanoic acid: CH3COOH

3. **Understand the Reaction with Sodium Hydrogen Carbonate**:
- Sodium hydrogen carbonate (NaHCO3) is a weak base. It reacts with acids to produce carbon dioxide (CO2), water (H2O), and a salt.

4. **Reaction with Ethanol**:
- When ethanol is mixed with NaHCO3, no reaction occurs. This is because ethanol is not acidic enough to react with the weak base.

5. **Reaction with Ethanoic Acid**:
- When ethanoic acid reacts with NaHCO3, the following reaction occurs:
\[ \text{CH}_3\text{COOH} + \text{NaHCO}_3 \rightarrow \text{CH}_3\text{COONa} + \text{CO}_2 + \text{H}_2\text{O} \]
- In this reaction, carbon dioxide gas is evolved, which can be observed as bubbling or fizzing.

6. **Conclusion**:
- Since ethanol does not react with NaHCO3, while ethanoic acid does, we can use this reaction to distinguish between ethanol and ethanoic acid.

### Final Answer:
Sodium hydrogen carbonate can be used to distinguish between ethanol (no reaction) and ethanoic acid (reaction produces CO2).