Which of the following substance produces brisk effervescence with baking soda solution?

Options

A. Ethanoic acid
B. Table salt
C. Vinegar
D. Sunflower oil

Explanation

To determine which of the following substances produces brisk effervescence with baking soda solution, we need to analyze the reaction between baking soda (sodium bicarbonate, NaHCO₃) and the given substances.

### Step-by-Step Solution:

1. **Identify the Reaction**: Brisk effervescence occurs when a substance reacts with an acid to produce carbon dioxide (CO₂) gas. Baking soda is a basic compound, and it reacts with acids to produce CO₂.

2. **List the Substances**: The question implies that there are multiple substances to consider. Common substances that produce effervescence with baking soda include acids like acetic acid (ethanoic acid), citric acid, hydrochloric acid, etc.

3. **Check for Acids**: Among the substances, we need to identify which ones are acids. For example, acetic acid (found in vinegar) is a weak acid and will react with baking soda.

4. **Write the Reaction**: For acetic acid (CH₃COOH) reacting with baking soda (NaHCO₃):
\[ \text{CH}_3\text{COOH} + \text{NaHCO}_3 \rightarrow \text{CH}_3\text{COONa} + \text{CO}_2 + \text{H}_2\text{O} \]
This reaction produces sodium acetate, carbon dioxide, and water, leading to brisk effervescence due to the release of CO₂ gas.

5. **Conclusion**: Therefore, if the substances include acetic acid or vinegar, they will produce brisk effervescence when mixed with baking soda.

6. **Final Answer**: The substances that produce brisk effervescence with baking soda solution are acetic acid (ethanoic acid) and any other acid present in the options.