Aldehyde and ketones can decolourise

Options

A. Bromine water
B. Quick lime
C. Dil. `H_(2)SO_(4)`
D. None of these

Explanation

To solve the question regarding which substances can decolorize aldehydes and ketones, we will analyze each option provided.

### Step-by-Step Solution:

1. **Understanding Aldehydes and Ketones**:
- Aldehydes have the functional group RCHO, while ketones have the functional group RC(=O)R'. Both of these compounds can participate in certain chemical reactions.

2. **Analyzing the Options**:
- **Option 1: Bromine Water**:
- Bromine water is known to decolorize in the presence of alkenes and alkynes due to the addition reaction. However, it does not react with aldehydes or ketones. Therefore, this option is incorrect.

- **Option 2: Quick Lime (CaO)**:
- Quick lime (calcium oxide) does not react with aldehydes or ketones. It is primarily used in drying and does not have a decolorizing effect on these compounds. This option is also incorrect.

- **Option 3: Dilute H2SO4**:
- Dilute sulfuric acid does not react with aldehydes or ketones in a way that would lead to decolorization. Therefore, this option is incorrect as well.

- **Option 4: None of These**:
- Since none of the previous options (1, 2, or 3) can decolorize aldehydes or ketones, this option is the correct answer.

3. **Conclusion**:
- The correct answer is **Option 4: None of These**.

### Final Answer:
**The answer is Option 4: None of These.**