Two jars A and B are filled with hydrocarbons. Br2 in `C Cl_(4)` is added to these jars. A does not decolourise the `Br_(2)` solution, but B decolourises. What are A and B -

Options

A. Alkane and alkene
B. Alkene and alkane
C. Both
D. None

Answer

To solve the problem, we need to identify the hydrocarbons in jars A and B based on their reactions with bromine (Br2) in carbon tetrachloride (CCl4).

### Step-by-Step Solution:

1. **Understanding the Reaction**:
- When bromine is added to hydrocarbons in CCl4, it can either react with the hydrocarbons or remain unchanged.
- Alkanes (saturated hydrocarbons) do not react with bromine under these conditions, while alkenes (unsaturated hydrocarbons) do react and cause the bromine solution to decolorize.

2. **Analyzing Jar A**:
- It is stated that jar A does not decolorize the Br2 solution.
- This indicates that the hydrocarbon in jar A is not reacting with bromine, which suggests that jar A contains an alkane.

3. **Analyzing Jar B**:
- In contrast, jar B does decolorize the Br2 solution.
- This indicates that the hydrocarbon in jar B is reacting with bromine, which suggests that jar B contains an alkene.

4. **Conclusion**:
- Based on the observations:
- Jar A contains an **alkane** (which does not react with Br2).
- Jar B contains an **alkene** (which reacts with Br2 and causes decolorization).

### Final Answer:
- A = Alkane
- B = Alkene