Among the compounds , Benzene, Carbon tetrachloride, Naphthalene, Benzoic acid, Isooctane and Anthracene, how many can be purified by sublimation.

Answer

To determine how many of the given compounds can be purified by sublimation, we need to analyze each compound based on its physical state and properties related to sublimation.

### Step-by-Step Solution:

1. **Understanding Sublimation**:
- Sublimation is the process where a solid changes directly into a gas without passing through the liquid phase. This process is typically used to purify solid volatile compounds.

2. **List of Compounds**:
- The compounds provided are:
- Benzene
- Carbon tetrachloride (CCl4)
- Naphthalene
- Benzoic acid
- Isooctane
- Anthracene

3. **Analyzing Each Compound**:
- **Benzene**:
- State: Liquid
- Conclusion: Cannot be purified by sublimation.
- **Carbon Tetrachloride (CCl4)**:
- State: Liquid
- Conclusion: Cannot be purified by sublimation.
- **Naphthalene**:
- State: Solid
- Conclusion: Can be purified by sublimation.
- **Benzoic Acid**:
- State: Solid
- Conclusion: Can be purified by sublimation.
- **Isooctane**:
- State: Liquid
- Conclusion: Cannot be purified by sublimation.
- **Anthracene**:
- State: Solid
- Conclusion: Can be purified by sublimation.

4. **Counting the Compounds that Can be Purified by Sublimation**:
- From the analysis, the compounds that can be purified by sublimation are:
- Naphthalene
- Benzoic acid
- Anthracene
- Total: 3 compounds.

### Final Answer:
**Three compounds can be purified by sublimation: Naphthalene, Benzoic acid, and Anthracene.**

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